| Value | Category | Cases | |
|---|---|---|---|
| 1990 | 798 |
91.6%
|
|
| 1991 | 12 |
1.4%
|
|
| 1992 | 16 |
1.8%
|
|
| 1993 | 13 |
1.5%
|
|
| 1994 | 16 |
1.8%
|
|
| 1995 | 10 |
1.1%
|
|
| 1996 | 2 |
0.2%
|
|
| 1997 | 4 |
0.5%
|
|
| Sysmiss | 50 |