| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 2 |
0.7%
|
|
| 2006 | 4 |
1.4%
|
|
| 2007 | 6 |
2.1%
|
|
| 2008 | 32 |
11.3%
|
|
| 2009 | 60 |
21.3%
|
|
| 2010 | 178 |
63.1%
|
|
| Sysmiss | 28 |