| Value | Category | Cases | |
|---|---|---|---|
| 2009 | 3 |
33.3%
|
|
| 2010 | 3 |
33.3%
|
|
| 2011 | 1 |
11.1%
|
|
| 2012 | 2 |
22.2%
|
|
| Sysmiss | 454 |