| Value | Category | Cases | |
|---|---|---|---|
| 1944 | 1 | 
                                
                                0.3%
                             | |
| 1948 | 2 | 
                                
                                0.6%
                             | |
| 1950 | 1 | 
                                
                                0.3%
                             | |
| 1952 | 1 | 
                                
                                0.3%
                             | |
| 1954 | 1 | 
                                
                                0.3%
                             | |
| 1956 | 1 | 
                                
                                0.3%
                             | |
| 1957 | 2 | 
                                
                                0.6%
                             | |
| 1958 | 2 | 
                                
                                0.6%
                             | |
| 1959 | 5 | 
                                
                                1.5%
                             | |
| 1960 | 2 | 
                                
                                0.6%
                             | |
| 1961 | 1 | 
                                
                                0.3%
                             | |
| 1962 | 1 | 
                                
                                0.3%
                             | |
| 1963 | 1 | 
                                
                                0.3%
                             | |
| 1964 | 4 | 
                                
                                1.2%
                             | |
| 1965 | 4 | 
                                
                                1.2%
                             | |
| 1966 | 5 | 
                                
                                1.5%
                             | |
| 1967 | 7 | 
                                
                                2.1%
                             | |
| 1968 | 5 | 
                                
                                1.5%
                             | |
| 1969 | 5 | 
                                
                                1.5%
                             | |
| 1970 | 8 | 
                                
                                2.4%
                             | |
| 1971 | 2 | 
                                
                                0.6%
                             | |
| 1972 | 4 | 
                                
                                1.2%
                             | |
| 1973 | 5 | 
                                
                                1.5%
                             | |
| 1974 | 6 | 
                                
                                1.8%
                             | |
| 1975 | 6 | 
                                
                                1.8%
                             | |
| 1976 | 12 | 
                                
                                3.6%
                             | |
| 1977 | 3 | 
                                
                                0.9%
                             | |
| 1978 | 12 | 
                                
                                3.6%
                             | |
| 1979 | 6 | 
                                
                                1.8%
                             | |
| 1980 | 9 | 
                                
                                2.7%
                             | |
| 1981 | 7 | 
                                
                                2.1%
                             | |
| 1982 | 21 | 
                                
                                6.3%
                             | |
| 1983 | 17 | 
                                
                                5.1%
                             | |
| 1984 | 14 | 
                                
                                4.2%
                             | |
| 1985 | 16 | 
                                
                                4.8%
                             | |
| 1986 | 22 | 
                                
                                6.6%
                             | |
| 1987 | 21 | 
                                
                                6.3%
                             | |
| 1988 | 27 | 
                                
                                8.2%
                             | |
| 1989 | 20 | 
                                
                                6%
                             | |
| 1990 | 23 | 
                                
                                6.9%
                             | |
| 1991 | 4 | 
                                
                                1.2%
                             | |
| 1992 | 1 | 
                                
                                0.3%
                             | |
| 1996 | 2 | 
                                
                                0.6%
                             | |
| 9995 | Missing | 0 | 
                                
                                0%
                             | 
| 9996 | Other | 0 | 
                                
                                0%
                             | 
| 9997 | Refused | 0 | 
                                
                                0%
                             | 
| 9998 | Dont Know | 12 | 
                                
                                3.6%
                             | 
| 9999 | Not Applicable | 0 | 
                                
                                0%
                             |