| Value | Category | Cases | |
|---|---|---|---|
| 2011 | 1 |
0.1%
|
|
| 2012 | 14 |
1.2%
|
|
| 2013 | 52 |
4.4%
|
|
| 2014 | 89 |
7.5%
|
|
| 2015 | 257 |
21.8%
|
|
| 2016 | 511 |
43.3%
|
|
| 2017 | 257 |
21.8%
|
|
| Sysmiss | 1559 |