| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 11 |
1.3%
|
|
| 2009 | 246 |
29.8%
|
|
| 2010 | 537 |
65%
|
|
| 2011 | 32 |
3.9%
|
|
| Sysmiss | 11504 |