| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1974 | 1 | 0 |
0.1%
|
|
| 1975 | 1 | 1 |
0.5%
|
|
| 1976 | 5 | 5 |
2.6%
|
|
| 1977 | 5 | 4 |
1.8%
|
|
| 1978 | 8 | 8 |
3.9%
|
|
| 1979 | 17 | 11 |
5.8%
|
|
| 1980 | 16 | 14 |
7.4%
|
|
| 1981 | 19 | 15 |
8%
|
|
| 1982 | 21 | 18 |
9.5%
|
|
| 1983 | 23 | 22 |
11.3%
|
|
| 1984 | 20 | 13 |
6.8%
|
|
| 1985 | 26 | 13 |
6.9%
|
|
| 1986 | 29 | 21 |
11.1%
|
|
| 1987 | 19 | 12 |
6.1%
|
|
| 1988 | 21 | 17 |
9.1%
|
|
| 1989 | 11 | 6 |
3.1%
|
|
| 1990 | 8 | 4 |
2.3%
|
|
| 1991 | 3 | 4 |
2.3%
|
|
| 1992 | 3 | 3 |
1.4%
|
|
| Sysmiss | 3037 | 3102 |