| Value | Category | Cases | |
|---|---|---|---|
| 2011 | 366 |
12.4%
|
|
| 2012 | 462 |
15.7%
|
|
| 2013 | 561 |
19%
|
|
| 2014 | 543 |
18.4%
|
|
| 2015 | 647 |
21.9%
|
|
| 2016 | 370 |
12.5%
|
|
| Sysmiss | 3087 |