| Value | Category | Cases | |
|---|---|---|---|
| 2010 | 1 |
6.7%
|
|
| 2011 | 5 |
33.3%
|
|
| 2012 | 6 |
40%
|
|
| 2013 | 3 |
20%
|
|
| Sysmiss | 35 |