| value | category | cases | |
|---|---|---|---|
| 1971 | 2 |
1.1%
|
|
| 1972 | 2 |
1.1%
|
|
| 1973 | 6 |
3.3%
|
|
| 1974 | 2 |
1.1%
|
|
| 1975 | 12 |
6.6%
|
|
| 1976 | 14 |
7.7%
|
|
| 1977 | 11 |
6%
|
|
| 1978 | 20 |
11%
|
|
| 1979 | 10 |
5.5%
|
|
| 1980 | 18 |
9.9%
|
|
| 1981 | 22 |
12.1%
|
|
| 1982 | 18 |
9.9%
|
|
| 1983 | 13 |
7.1%
|
|
| 1984 | 10 |
5.5%
|
|
| 1985 | 10 |
5.5%
|
|
| 1986 | 4 |
2.2%
|
|
| 1987 | 4 |
2.2%
|
|
| 1988 | 3 |
1.6%
|
|
| 1990 | 1 |
0.5%
|
|
| Sysmiss | 2158 |