| Value | Category | Cases | |
|---|---|---|---|
| 2013 | 1 |
0.3%
|
|
| 2015 | 47 |
15.3%
|
|
| 2016 | 259 |
84.4%
|
|
| 9999 | 9999. MISSING | 0 |
0%
|
| Sysmiss | 3 |