| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 22 |
17.2%
|
|
| 2001 | 21 |
16.4%
|
|
| 2002 | 30 |
23.4%
|
|
| 2003 | 36 |
28.1%
|
|
| 2004 | 19 |
14.8%
|