| Value | Category | Cases | |
|---|---|---|---|
| 2012 | 1 |
0.1%
|
|
| 2013 | 1 |
0.1%
|
|
| 2014 | 234 |
27.4%
|
|
| 2015 | 615 |
72.1%
|
|
| 9999 | 9999. Missing | 2 |
0.2%
|
| Sysmiss | 47 |