| Value | Category | Cases | |
|---|---|---|---|
| 2005 | 10 |
0.9%
|
|
| 2006 | 223 |
20.1%
|
|
| 2007 | 246 |
22.1%
|
|
| 2008 | 228 |
20.5%
|
|
| 2009 | 205 |
18.5%
|
|
| 2010 | 194 |
17.5%
|
|
| 2011 | 5 |
0.5%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | Don't know | 0 |
0%
|
| Sysmiss | 12960 |