| Value | Category | Cases | |
|---|---|---|---|
| 2009 | 9 |
25%
|
|
| 2010 | 10 |
27.8%
|
|
| 2011 | 4 |
11.1%
|
|
| 2012 | 9 |
25%
|
|
| 2013 | 4 |
11.1%
|
|
| Sysmiss | 951 |