| Value | Category | Cases | |
|---|---|---|---|
| 1946 | 1 |
0.3%
|
|
| 1948 | 1 |
0.3%
|
|
| 1955 | 1 |
0.3%
|
|
| 1956 | 1 |
0.3%
|
|
| 1957 | 3 |
0.9%
|
|
| 1958 | 1 |
0.3%
|
|
| 1959 | 3 |
0.9%
|
|
| 1960 | 3 |
0.9%
|
|
| 1961 | 3 |
0.9%
|
|
| 1962 | 4 |
1.3%
|
|
| 1963 | 4 |
1.3%
|
|
| 1964 | 3 |
0.9%
|
|
| 1965 | 7 |
2.2%
|
|
| 1966 | 4 |
1.3%
|
|
| 1967 | 6 |
1.9%
|
|
| 1968 | 3 |
0.9%
|
|
| 1969 | 5 |
1.6%
|
|
| 1970 | 10 |
3.1%
|
|
| 1971 | 4 |
1.3%
|
|
| 1972 | 13 |
4.1%
|
|
| 1973 | 11 |
3.5%
|
|
| 1974 | 9 |
2.8%
|
|
| 1975 | 20 |
6.3%
|
|
| 1976 | 9 |
2.8%
|
|
| 1977 | 13 |
4.1%
|
|
| 1978 | 8 |
2.5%
|
|
| 1979 | 7 |
2.2%
|
|
| 1980 | 15 |
4.7%
|
|
| 1981 | 10 |
3.1%
|
|
| 1982 | 17 |
5.3%
|
|
| 1983 | 25 |
7.9%
|
|
| 1984 | 15 |
4.7%
|
|
| 1985 | 13 |
4.1%
|
|
| 1986 | 7 |
2.2%
|
|
| 1987 | 8 |
2.5%
|
|
| 1988 | 11 |
3.5%
|
|
| 1989 | 4 |
1.3%
|
|
| 1990 | 10 |
3.1%
|
|
| 1991 | 4 |
1.3%
|
|
| 1992 | 2 |
0.6%
|
|
| 1993 | 7 |
2.2%
|
|
| 1994 | 1 |
0.3%
|
|
| 1998 | 1 |
0.3%
|
|
| 9998 | 9998. Don't know | 11 |
3.5%
|
| 9999 | 9999. Missing | 0 |
0%
|
| Sysmiss | 28 |