| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 52 |
2.4%
|
|
| 2005 | 144 |
6.8%
|
|
| 2006 | 240 |
11.3%
|
|
| 2007 | 494 |
23.2%
|
|
| 2008 | 1100 |
51.7%
|
|
| 2009 | 98 |
4.6%
|
|
| Sysmiss | 3951 |