| Value | Category | Cases | |
|---|---|---|---|
| 2011 | 2 |
2.1%
|
|
| 2012 | 10 |
10.6%
|
|
| 2013 | 12 |
12.8%
|
|
| 2014 | 25 |
26.6%
|
|
| 2015 | 40 |
42.6%
|
|
| 2016 | 5 |
5.3%
|
|
| Sysmiss | 12429 |