| Value | Category | Cases | |
|---|---|---|---|
| 2011 | 206 |
7.6%
|
|
| 2012 | 479 |
17.6%
|
|
| 2013 | 516 |
19%
|
|
| 2014 | 560 |
20.6%
|
|
| 2015 | 609 |
22.4%
|
|
| 2016 | 344 |
12.7%
|
|
| Sysmiss | 3322 |