| Value | Category | Cases | |
|---|---|---|---|
| 1940 | 4 |
1.2%
|
|
| 1941 | 1 |
0.3%
|
|
| 1944 | 1 |
0.3%
|
|
| 1945 | 2 |
0.6%
|
|
| 1947 | 3 |
0.9%
|
|
| 1948 | 2 |
0.6%
|
|
| 1949 | 3 |
0.9%
|
|
| 1950 | 5 |
1.5%
|
|
| 1951 | 2 |
0.6%
|
|
| 1952 | 1 |
0.3%
|
|
| 1953 | 2 |
0.6%
|
|
| 1954 | 1 |
0.3%
|
|
| 1955 | 6 |
1.8%
|
|
| 1956 | 2 |
0.6%
|
|
| 1957 | 6 |
1.8%
|
|
| 1958 | 2 |
0.6%
|
|
| 1959 | 6 |
1.8%
|
|
| 1960 | 7 |
2%
|
|
| 1961 | 4 |
1.2%
|
|
| 1962 | 7 |
2%
|
|
| 1963 | 15 |
4.4%
|
|
| 1964 | 7 |
2%
|
|
| 1965 | 17 |
5%
|
|
| 1966 | 20 |
5.8%
|
|
| 1967 | 17 |
5%
|
|
| 1968 | 11 |
3.2%
|
|
| 1969 | 13 |
3.8%
|
|
| 1970 | 17 |
5%
|
|
| 1971 | 12 |
3.5%
|
|
| 1972 | 11 |
3.2%
|
|
| 1973 | 7 |
2%
|
|
| 1974 | 11 |
3.2%
|
|
| 1975 | 10 |
2.9%
|
|
| 1976 | 7 |
2%
|
|
| 1977 | 10 |
2.9%
|
|
| 1978 | 12 |
3.5%
|
|
| 1979 | 13 |
3.8%
|
|
| 1980 | 10 |
2.9%
|
|
| 1981 | 3 |
0.9%
|
|
| 1982 | 7 |
2%
|
|
| 1983 | 6 |
1.8%
|
|
| 1984 | 5 |
1.5%
|
|
| 1985 | 6 |
1.8%
|
|
| 1986 | 4 |
1.2%
|
|
| 1987 | 3 |
0.9%
|
|
| 1989 | 3 |
0.9%
|
|
| 1990 | 1 |
0.3%
|
|
| 9998 | 9998. Don't know | 17 |
5%
|
| 9999 | 9999. Missing | 0 |
0%
|
| Sysmiss | 4 |