| Value | Category | Cases | |
|---|---|---|---|
| 2012 | 4 |
0.5%
|
|
| 2013 | 1 |
0.1%
|
|
| 2014 | 16 |
2.1%
|
|
| 2015 | 753 |
97.3%
|
|
| Sysmiss | 317 |