| value | category | cases | |
|---|---|---|---|
| 1971 | 1 |
1.1%
|
|
| 1972 | 3 |
3.2%
|
|
| 1973 | 6 |
6.5%
|
|
| 1974 | 3 |
3.2%
|
|
| 1975 | 6 |
6.5%
|
|
| 1976 | 9 |
9.7%
|
|
| 1977 | 6 |
6.5%
|
|
| 1978 | 11 |
11.8%
|
|
| 1979 | 3 |
3.2%
|
|
| 1980 | 13 |
14%
|
|
| 1981 | 8 |
8.6%
|
|
| 1982 | 9 |
9.7%
|
|
| 1983 | 5 |
5.4%
|
|
| 1984 | 5 |
5.4%
|
|
| 1985 | 2 |
2.2%
|
|
| 1986 | 1 |
1.1%
|
|
| 1987 | 1 |
1.1%
|
|
| 1989 | 1 |
1.1%
|
|
| Sysmiss | 2247 |