| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 2 |
0.2%
|
|
| 2007 | 3 |
0.3%
|
|
| 2008 | 20 |
1.8%
|
|
| 2009 | 617 |
55.6%
|
|
| 2010 | 468 |
42.2%
|
|
| Sysmiss | 475 |