| Value | Category | Cases | |
|---|---|---|---|
| 1990 | 1 |
1%
|
|
| 1992 | 2 |
2%
|
|
| 1993 | 1 |
1%
|
|
| 1995 | 3 |
3%
|
|
| 1996 | 1 |
1%
|
|
| 1997 | 4 |
4%
|
|
| 1998 | 8 |
7.9%
|
|
| 1999 | 5 |
5%
|
|
| 2000 | 11 |
10.9%
|
|
| 2001 | 16 |
15.8%
|
|
| 2002 | 49 |
48.5%
|
|
| Sysmiss | 183 |