| Value | Category | Cases | |
|---|---|---|---|
| 2011 | 404 |
12.7%
|
|
| 2012 | 504 |
15.9%
|
|
| 2013 | 596 |
18.8%
|
|
| 2014 | 581 |
18.3%
|
|
| 2015 | 691 |
21.8%
|
|
| 2016 | 400 |
12.6%
|
|
| Sysmiss | 2860 |