| Value | Category | Cases | |
|---|---|---|---|
| 1987 | 2 |
8%
|
|
| 1988 | 1 |
4%
|
|
| 1989 | 1 |
4%
|
|
| 1990 | 3 |
12%
|
|
| 1992 | 2 |
8%
|
|
| 1993 | 1 |
4%
|
|
| 1994 | 2 |
8%
|
|
| 1995 | 2 |
8%
|
|
| 1996 | 6 |
24%
|
|
| 1997 | 2 |
8%
|
|
| 1998 | 2 |
8%
|
|
| 2000 | 1 |
4%
|
|
| Sysmiss | 14609 |