| Value | Category | Cases | |
|---|---|---|---|
| 2009 | 4 |
9.5%
|
|
| 2010 | 1 |
2.4%
|
|
| 2011 | 15 |
35.7%
|
|
| 2012 | 22 |
52.4%
|
|
| Sysmiss | 438 |