| Value | Category | Cases | |
|---|---|---|---|
| 1941 | 1 |
0.3%
|
|
| 1942 | 1 |
0.3%
|
|
| 1947 | 2 |
0.6%
|
|
| 1950 | 1 |
0.3%
|
|
| 1951 | 3 |
0.9%
|
|
| 1952 | 2 |
0.6%
|
|
| 1953 | 3 |
0.9%
|
|
| 1954 | 2 |
0.6%
|
|
| 1955 | 2 |
0.6%
|
|
| 1956 | 4 |
1.2%
|
|
| 1957 | 3 |
0.9%
|
|
| 1958 | 4 |
1.2%
|
|
| 1959 | 5 |
1.5%
|
|
| 1960 | 1 |
0.3%
|
|
| 1961 | 8 |
2.4%
|
|
| 1962 | 9 |
2.7%
|
|
| 1963 | 5 |
1.5%
|
|
| 1964 | 11 |
3.4%
|
|
| 1965 | 6 |
1.8%
|
|
| 1966 | 15 |
4.6%
|
|
| 1967 | 7 |
2.1%
|
|
| 1968 | 8 |
2.4%
|
|
| 1969 | 7 |
2.1%
|
|
| 1970 | 5 |
1.5%
|
|
| 1971 | 11 |
3.4%
|
|
| 1972 | 13 |
4%
|
|
| 1973 | 10 |
3%
|
|
| 1974 | 22 |
6.7%
|
|
| 1975 | 12 |
3.7%
|
|
| 1976 | 16 |
4.9%
|
|
| 1977 | 11 |
3.4%
|
|
| 1978 | 15 |
4.6%
|
|
| 1979 | 14 |
4.3%
|
|
| 1980 | 6 |
1.8%
|
|
| 1981 | 11 |
3.4%
|
|
| 1982 | 7 |
2.1%
|
|
| 1983 | 6 |
1.8%
|
|
| 1984 | 2 |
0.6%
|
|
| 1985 | 4 |
1.2%
|
|
| 1986 | 2 |
0.6%
|
|
| 1988 | 3 |
0.9%
|
|
| 1989 | 8 |
2.4%
|
|
| 1990 | 9 |
2.7%
|
|
| 1991 | 9 |
2.7%
|
|
| 1992 | 5 |
1.5%
|
|
| 1993 | 1 |
0.3%
|
|
| 1994 | 2 |
0.6%
|
|
| 1995 | 2 |
0.6%
|
|
| 1996 | 1 |
0.3%
|
|
| 1999 | 1 |
0.3%
|
|
| 2000 | 1 |
0.3%
|
|
| 9999 | 9999. Don't know | 9 |
2.7%
|
| Sysmiss | 671 |