| Value | Category | Cases | |
|---|---|---|---|
| 2011 | 18 |
0.8%
|
|
| 2012 | 368 |
16.9%
|
|
| 2013 | 436 |
20%
|
|
| 2014 | 528 |
24.2%
|
|
| 2015 | 491 |
22.5%
|
|
| 2016 | 339 |
15.6%
|
|
| Sysmiss | 3856 |