| Value | Category | Cases | |
|---|---|---|---|
| 2007 | 1 |
3.6%
|
|
| 2010 | 4 |
14.3%
|
|
| 2011 | 5 |
17.9%
|
|
| 2012 | 18 |
64.3%
|
|
| Sysmiss | 435 |