| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 1 |
0.3%
|
|
| 2006 | 4 |
1.4%
|
|
| 2007 | 19 |
6.6%
|
|
| 2008 | 148 |
51%
|
|
| 2009 | 115 |
39.7%
|
|
| 2010 | 3 |
1%
|
|
| Sysmiss | 20 |