| Value | Category | Cases | |
|---|---|---|---|
| 2008 | 1 |
12.5%
|
|
| 2009 | 3 |
37.5%
|
|
| 2010 | 3 |
37.5%
|
|
| 2011 | 1 |
12.5%
|
|
| Sysmiss | 1001 |