| Value | Category | Cases | |
|---|---|---|---|
| 1999 | 1 |
2.2%
|
|
| 2000 | 4 |
8.7%
|
|
| 2001 | 16 |
34.8%
|
|
| 2002 | 25 |
54.3%
|
|
| Sysmiss | 238 |