| Value | Category | Cases | |
|---|---|---|---|
| 1981 | 2 |
9.5%
|
|
| 1982 | 1 |
4.8%
|
|
| 1983 | 2 |
9.5%
|
|
| 1984 | 2 |
9.5%
|
|
| 1985 | 1 |
4.8%
|
|
| 1986 | 3 |
14.3%
|
|
| 1987 | 1 |
4.8%
|
|
| 1988 | 2 |
9.5%
|
|
| 1989 | 2 |
9.5%
|
|
| 1990 | 1 |
4.8%
|
|
| 1993 | 2 |
9.5%
|
|
| 1994 | 2 |
9.5%
|
|
| Sysmiss | 38697 |