| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 345 |
7.3%
|
|
| 2007 | 1024 |
21.7%
|
|
| 2008 | 1054 |
22.4%
|
|
| 2009 | 970 |
20.6%
|
|
| 2010 | 916 |
19.4%
|
|
| 2011 | 395 |
8.4%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9999 | Missing | 10 |
0.2%
|
| Sysmiss | 113 |