| Value | Category | Cases | |
|---|---|---|---|
| 2002 | 18 |
20.7%
|
|
| 2003 | 9 |
10.3%
|
|
| 2004 | 10 |
11.5%
|
|
| 2005 | 16 |
18.4%
|
|
| 2006 | 32 |
36.8%
|
|
| 2007 | 2 |
2.3%
|
|
| Sysmiss | 12 |