| Value | Category | Cases | |
|---|---|---|---|
| 1978 | 1 |
2%
|
|
| 1980 | 1 |
2%
|
|
| 1981 | 2 |
4.1%
|
|
| 1982 | 2 |
4.1%
|
|
| 1983 | 6 |
12.2%
|
|
| 1984 | 3 |
6.1%
|
|
| 1985 | 6 |
12.2%
|
|
| 1986 | 5 |
10.2%
|
|
| 1987 | 4 |
8.2%
|
|
| 1988 | 9 |
18.4%
|
|
| 1989 | 2 |
4.1%
|
|
| 1990 | 2 |
4.1%
|
|
| 1991 | 2 |
4.1%
|
|
| 1992 | 3 |
6.1%
|
|
| 1996 | 1 |
2%
|
|
| Sysmiss | 7149 |