| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 1 |
0.2%
|
|
| 1996 | 2 |
0.3%
|
|
| 1997 | 34 |
5.5%
|
|
| 1998 | 38 |
6.1%
|
|
| 1999 | 68 |
10.9%
|
|
| 2000 | 96 |
15.4%
|
|
| 2001 | 222 |
35.7%
|
|
| 2002 | 161 |
25.9%
|
|
| Sysmiss | 7427 |