| Value | Category | Cases | |
|---|---|---|---|
| 4 | 2012 | 4 |
0.4%
|
| 5 | 2011 | 1 |
0.1%
|
| 6 | 2010 | 2 |
0.2%
|
| Sysmiss | 1004 |
99.3%
|