| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 14 |
4.4%
|
|
| 2000 | 94 |
29.4%
|
|
| 2001 | 102 |
31.9%
|
|
| 2002 | 108 |
33.8%
|
|
| 2003 | 2 |
0.6%
|
|
| Sysmiss | 679 |