| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 960 |
8.6%
|
|
| 2006 | 2299 |
20.7%
|
|
| 2007 | 2291 |
20.6%
|
|
| 2008 | 2208 |
19.9%
|
|
| 2009 | 2155 |
19.4%
|
|
| 2010 | 1197 |
10.8%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 163 |