| Value | Category | Cases | |
|---|---|---|---|
| 99 | Missing | 0 |
0%
|
| 2007 | 1 |
6.3%
|
|
| 2008 | 1 |
6.3%
|
|
| 2010 | 3 |
18.8%
|
|
| 2011 | 3 |
18.8%
|
|
| 2012 | 8 |
50%
|
|
| Sysmiss | 1709 |