| Value | Category | Cases | |
|---|---|---|---|
| 2010 | 13 |
25.5%
|
|
| 2011 | 6 |
11.8%
|
|
| 2012 | 7 |
13.7%
|
|
| 2013 | 12 |
23.5%
|
|
| 2014 | 8 |
15.7%
|
|
| 2015 | 5 |
9.8%
|
|
| Sysmiss | 14328 |