| value | category | cases | |
|---|---|---|---|
| 1969 | 1 |
1.6%
|
|
| 1970 | 2 |
3.2%
|
|
| 1971 | 2 |
3.2%
|
|
| 1972 | 5 |
7.9%
|
|
| 1973 | 7 |
11.1%
|
|
| 1974 | 5 |
7.9%
|
|
| 1975 | 14 |
22.2%
|
|
| 1976 | 3 |
4.8%
|
|
| 1977 | 6 |
9.5%
|
|
| 1978 | 7 |
11.1%
|
|
| 1979 | 4 |
6.3%
|
|
| 1980 | 2 |
3.2%
|
|
| 1982 | 1 |
1.6%
|
|
| 1983 | 3 |
4.8%
|
|
| 1986 | 1 |
1.6%
|
|
| Sysmiss | 12414 |