| Value | Category | Cases | |
|---|---|---|---|
| 1929 | 1 | 
                            
                             
                                
                                1.4%
                                                             
                            
                         | 
                        
                    |
| 1935 | 1 | 
                            
                             
                                
                                1.4%
                                                             
                            
                         | 
                        
                    |
| 1953 | 1 | 
                            
                             
                                
                                1.4%
                                                             
                            
                         | 
                        
                    |
| 1954 | 2 | 
                            
                             
                                
                                2.8%
                                                             
                            
                         | 
                        
                    |
| 1958 | 1 | 
                            
                             
                                
                                1.4%
                                                             
                            
                         | 
                        
                    |
| 1959 | 2 | 
                            
                             
                                
                                2.8%
                                                             
                            
                         | 
                        
                    |
| 1961 | 3 | 
                            
                             
                                
                                4.2%
                                                             
                            
                         | 
                        
                    |
| 1963 | 1 | 
                            
                             
                                
                                1.4%
                                                             
                            
                         | 
                        
                    |
| 1964 | 1 | 
                            
                             
                                
                                1.4%
                                                             
                            
                         | 
                        
                    |
| 1965 | 3 | 
                            
                             
                                
                                4.2%
                                                             
                            
                         | 
                        
                    |
| 1966 | 2 | 
                            
                             
                                
                                2.8%
                                                             
                            
                         | 
                        
                    |
| 1967 | 2 | 
                            
                             
                                
                                2.8%
                                                             
                            
                         | 
                        
                    |
| 1968 | 1 | 
                            
                             
                                
                                1.4%
                                                             
                            
                         | 
                        
                    |
| 1969 | 2 | 
                            
                             
                                
                                2.8%
                                                             
                            
                         | 
                        
                    |
| 1970 | 1 | 
                            
                             
                                
                                1.4%
                                                             
                            
                         | 
                        
                    |
| 1971 | 1 | 
                            
                             
                                
                                1.4%
                                                             
                            
                         | 
                        
                    |
| 1972 | 2 | 
                            
                             
                                
                                2.8%
                                                             
                            
                         | 
                        
                    |
| 1973 | 3 | 
                            
                             
                                
                                4.2%
                                                             
                            
                         | 
                        
                    |
| 1974 | 4 | 
                            
                             
                                
                                5.6%
                                                             
                            
                         | 
                        
                    |
| 1977 | 1 | 
                            
                             
                                
                                1.4%
                                                             
                            
                         | 
                        
                    |
| 1978 | 1 | 
                            
                             
                                
                                1.4%
                                                             
                            
                         | 
                        
                    |
| 1980 | 4 | 
                            
                             
                                
                                5.6%
                                                             
                            
                         | 
                        
                    |
| 1981 | 2 | 
                            
                             
                                
                                2.8%
                                                             
                            
                         | 
                        
                    |
| 1982 | 1 | 
                            
                             
                                
                                1.4%
                                                             
                            
                         | 
                        
                    |
| 1984 | 3 | 
                            
                             
                                
                                4.2%
                                                             
                            
                         | 
                        
                    |
| 1985 | 3 | 
                            
                             
                                
                                4.2%
                                                             
                            
                         | 
                        
                    |
| 1986 | 3 | 
                            
                             
                                
                                4.2%
                                                             
                            
                         | 
                        
                    |
| 1987 | 1 | 
                            
                             
                                
                                1.4%
                                                             
                            
                         | 
                        
                    |
| 1990 | 1 | 
                            
                             
                                
                                1.4%
                                                             
                            
                         | 
                        
                    |
| 1991 | 1 | 
                            
                             
                                
                                1.4%
                                                             
                            
                         | 
                        
                    |
| 1992 | 2 | 
                            
                             
                                
                                2.8%
                                                             
                            
                         | 
                        
                    |
| 1993 | 2 | 
                            
                             
                                
                                2.8%
                                                             
                            
                         | 
                        
                    |
| 1995 | 2 | 
                            
                             
                                
                                2.8%
                                                             
                            
                         | 
                        
                    |
| 1996 | 2 | 
                            
                             
                                
                                2.8%
                                                             
                            
                         | 
                        
                    |
| 1998 | 2 | 
                            
                             
                                
                                2.8%
                                                             
                            
                         | 
                        
                    |
| 1999 | 2 | 
                            
                             
                                
                                2.8%
                                                             
                            
                         | 
                        
                    |
| 2001 | 1 | 
                            
                             
                                
                                1.4%
                                                             
                            
                         | 
                        
                    |
| 2002 | 1 | 
                            
                             
                                
                                1.4%
                                                             
                            
                         | 
                        
                    |
| 2003 | 1 | 
                            
                             
                                
                                1.4%
                                                             
                            
                         | 
                        
                    |
| 2004 | 1 | 
                            
                             
                                
                                1.4%
                                                             
                            
                         | 
                        
                    |
| 9998 | Don't Know | 1 | 
                            
                             
                                
                                1.4%
                                                             
                            
                         |