| Value | Category | Cases | |
|---|---|---|---|
| 2006 | 150 |
3.2%
|
|
| 2007 | 959 |
20.5%
|
|
| 2008 | 1099 |
23.5%
|
|
| 2009 | 975 |
20.9%
|
|
| 2010 | 900 |
19.3%
|
|
| 2011 | 587 |
12.6%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9999 | Missing | 2 |
0%
|
| Sysmiss | 100 |