| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 3 |
3.9%
|
|
| 2005 | 2 |
2.6%
|
|
| 2006 | 3 |
3.9%
|
|
| 2007 | 5 |
6.6%
|
|
| 2008 | 51 |
67.1%
|
|
| 2009 | 12 |
15.8%
|
|
| Sysmiss | 51384 |