| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 258 |
21.1%
|
|
| 2001 | 233 |
19.1%
|
|
| 2002 | 227 |
18.6%
|
|
| 2003 | 321 |
26.3%
|
|
| 2004 | 182 |
14.9%
|
|
| Sysmiss | 410 |