| Value | Category | Cases | |
|---|---|---|---|
| 1946 | 1 |
3.6%
|
|
| 1951 | 1 |
3.6%
|
|
| 1953 | 2 |
7.1%
|
|
| 1955 | 1 |
3.6%
|
|
| 1957 | 1 |
3.6%
|
|
| 1963 | 1 |
3.6%
|
|
| 1966 | 1 |
3.6%
|
|
| 1969 | 3 |
10.7%
|
|
| 1970 | 1 |
3.6%
|
|
| 1971 | 2 |
7.1%
|
|
| 1972 | 1 |
3.6%
|
|
| 1974 | 2 |
7.1%
|
|
| 1975 | 2 |
7.1%
|
|
| 1976 | 1 |
3.6%
|
|
| 1977 | 1 |
3.6%
|
|
| 1979 | 1 |
3.6%
|
|
| 1980 | 1 |
3.6%
|
|
| 1989 | 2 |
7.1%
|
|
| 1993 | 1 |
3.6%
|
|
| 1995 | 1 |
3.6%
|
|
| 9999 | 9999. Don't know | 1 |
3.6%
|
| Sysmiss | 971 |