| Value | Category | Cases | |
|---|---|---|---|
| 2003 | 167 |
6.2%
|
|
| 2004 | 431 |
16%
|
|
| 2005 | 541 |
20%
|
|
| 2006 | 647 |
24%
|
|
| 2007 | 784 |
29%
|
|
| 2008 | 129 |
4.8%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 15722 |