| Value | Category | Cases | |
|---|---|---|---|
| 1984 | 1 |
2.7%
|
|
| 1990 | 3 |
8.1%
|
|
| 1991 | 2 |
5.4%
|
|
| 1992 | 7 |
18.9%
|
|
| 1993 | 2 |
5.4%
|
|
| 1994 | 1 |
2.7%
|
|
| 1995 | 1 |
2.7%
|
|
| 1996 | 3 |
8.1%
|
|
| 1997 | 6 |
16.2%
|
|
| 1998 | 5 |
13.5%
|
|
| 1999 | 2 |
5.4%
|
|
| 2000 | 4 |
10.8%
|
|
| Sysmiss | 1745 |