| Value | Category | Cases | |
|---|---|---|---|
| 2011 | 1 |
0.3%
|
|
| 2012 | 2 |
0.6%
|
|
| 2013 | 4 |
1.3%
|
|
| 2014 | 13 |
4.2%
|
|
| 2015 | 233 |
74.7%
|
|
| 2016 | 59 |
18.9%
|
|
| Sysmiss | 27 |