| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1975 | 4 | 3 |
0.8%
|
|
| 1976 | 7 | 10 |
2.6%
|
|
| 1977 | 8 | 10 |
2.7%
|
|
| 1978 | 10 | 10 |
2.6%
|
|
| 1979 | 14 | 15 |
3.9%
|
|
| 1980 | 13 | 12 |
3.1%
|
|
| 1981 | 27 | 23 |
5.9%
|
|
| 1982 | 32 | 29 |
7.5%
|
|
| 1983 | 36 | 30 |
7.8%
|
|
| 1984 | 37 | 38 |
9.8%
|
|
| 1985 | 53 | 44 |
11.3%
|
|
| 1986 | 38 | 30 |
7.8%
|
|
| 1987 | 41 | 30 |
7.8%
|
|
| 1988 | 46 | 32 |
8.2%
|
|
| 1989 | 28 | 18 |
4.8%
|
|
| 1990 | 23 | 18 |
4.7%
|
|
| 1991 | 23 | 18 |
4.7%
|
|
| 1992 | 13 | 9 |
2.4%
|
|
| 1993 | 3 | 4 |
1.1%
|
|
| 1994 | 4 | 2 |
0.5%
|
|
| Sysmiss | 2833 | 2906 |