| Value | Category | Cases | |
|---|---|---|---|
| 2004 | 3 |
27.3%
|
|
| 2005 | 2 |
18.2%
|
|
| 2006 | 3 |
27.3%
|
|
| 2007 | 1 |
9.1%
|
|
| 2008 | 2 |
18.2%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 8433 |