| Value | Category | Cases | |
|---|---|---|---|
| 2009 | 1 |
4.3%
|
|
| 2010 | 3 |
13%
|
|
| 2011 | 3 |
13%
|
|
| 2012 | 6 |
26.1%
|
|
| 2013 | 9 |
39.1%
|
|
| 2014 | 1 |
4.3%
|
|
| Sysmiss | 1411 |