| Value | Category | Cases | |
|---|---|---|---|
| 1916 | 1 | 
                                
                                0.5%
                             | |
| 1939 | 1 | 
                                
                                0.5%
                             | |
| 1946 | 1 | 
                                
                                0.5%
                             | |
| 1950 | 1 | 
                                
                                0.5%
                             | |
| 1954 | 1 | 
                                
                                0.5%
                             | |
| 1956 | 1 | 
                                
                                0.5%
                             | |
| 1957 | 2 | 
                                
                                0.9%
                             | |
| 1960 | 3 | 
                                
                                1.4%
                             | |
| 1966 | 3 | 
                                
                                1.4%
                             | |
| 1969 | 1 | 
                                
                                0.5%
                             | |
| 1970 | 2 | 
                                
                                0.9%
                             | |
| 1972 | 2 | 
                                
                                0.9%
                             | |
| 1973 | 1 | 
                                
                                0.5%
                             | |
| 1974 | 1 | 
                                
                                0.5%
                             | |
| 1975 | 1 | 
                                
                                0.5%
                             | |
| 1977 | 2 | 
                                
                                0.9%
                             | |
| 1978 | 5 | 
                                
                                2.4%
                             | |
| 1980 | 2 | 
                                
                                0.9%
                             | |
| 1982 | 3 | 
                                
                                1.4%
                             | |
| 1983 | 5 | 
                                
                                2.4%
                             | |
| 1984 | 3 | 
                                
                                1.4%
                             | |
| 1985 | 2 | 
                                
                                0.9%
                             | |
| 1986 | 4 | 
                                
                                1.9%
                             | |
| 1989 | 2 | 
                                
                                0.9%
                             | |
| 1990 | 4 | 
                                
                                1.9%
                             | |
| 1991 | 3 | 
                                
                                1.4%
                             | |
| 1992 | 5 | 
                                
                                2.4%
                             | |
| 1993 | 7 | 
                                
                                3.3%
                             | |
| 1994 | 6 | 
                                
                                2.8%
                             | |
| 1995 | 2 | 
                                
                                0.9%
                             | |
| 1996 | 5 | 
                                
                                2.4%
                             | |
| 1997 | 7 | 
                                
                                3.3%
                             | |
| 1998 | 4 | 
                                
                                1.9%
                             | |
| 1999 | 9 | 
                                
                                4.2%
                             | |
| 2000 | 7 | 
                                
                                3.3%
                             | |
| 2001 | 7 | 
                                
                                3.3%
                             | |
| 2002 | 6 | 
                                
                                2.8%
                             | |
| 2003 | 11 | 
                                
                                5.2%
                             | |
| 2004 | 8 | 
                                
                                3.8%
                             | |
| 2005 | 13 | 
                                
                                6.1%
                             | |
| 2006 | 20 | 
                                
                                9.4%
                             | |
| 2007 | 11 | 
                                
                                5.2%
                             | |
| 2008 | 17 | 
                                
                                8%
                             | |
| 2009 | 5 | 
                                
                                2.4%
                             | |
| 9995 | Missing | 5 | 
                                
                                2.4%
                             | 
| 9996 | Other | 0 | 
                                
                                0%
                             | 
| 9997 | Refusal | 0 | 
                                
                                0%
                             | 
| 9998 | Dont Know | 0 | 
                                
                                0%
                             | 
| 9999 | Not Applicable | 0 | 
                                
                                0%
                             |