| Value | Category | Cases | |
|---|---|---|---|
| 1 | 2015 | 1 |
0.1%
|
| 2 | 2014 | 1 |
0.1%
|
| 4 | 2012 | 1 |
0.1%
|
| Sysmiss | 1008 |
99.7%
|