| Value | Category | Cases | |
|---|---|---|---|
| 2010 | 4 |
9.1%
|
|
| 2011 | 16 |
36.4%
|
|
| 2012 | 18 |
40.9%
|
|
| 2013 | 6 |
13.6%
|
|
| Sysmiss | 6 |