| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 37 |
2.3%
|
|
| 2005 | 35 |
2.1%
|
|
| 2006 | 60 |
3.7%
|
|
| 2007 | 154 |
9.4%
|
|
| 2008 | 478 |
29.3%
|
|
| 2009 | 866 |
53.1%
|
|
| Sysmiss | 49830 |