| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 117 |
17.2%
|
|
| 2001 | 111 |
16.3%
|
|
| 2002 | 103 |
15.2%
|
|
| 2003 | 213 |
31.4%
|
|
| 2004 | 135 |
19.9%
|
|
| Sysmiss | 952 |