| Value | Category | Cases | |
|---|---|---|---|
| 2011 | 300 |
10.2%
|
|
| 2012 | 485 |
16.5%
|
|
| 2013 | 569 |
19.3%
|
|
| 2014 | 566 |
19.2%
|
|
| 2015 | 642 |
21.8%
|
|
| 2016 | 381 |
12.9%
|
|
| Sysmiss | 3093 |