| Value | Category | Cases | |
|---|---|---|---|
| 1 | 2015 | 1 |
0.1%
|
| 2 | 2014 | 2 |
0.2%
|
| 3 | 2013 | 1 |
0.1%
|
| 5 | 2011 | 1 |
0.1%
|
| Sysmiss | 1006 |
99.5%
|