| Value | Category | Cases | |
|---|---|---|---|
| 2011 | 33 |
2.1%
|
|
| 2012 | 53 |
3.4%
|
|
| 2013 | 85 |
5.5%
|
|
| 2014 | 479 |
30.9%
|
|
| 2015 | 563 |
36.4%
|
|
| 2016 | 335 |
21.6%
|
|
| Sysmiss | 4488 |