| Value | Category | Cases | |
|---|---|---|---|
| 1995 | 1 |
12.5%
|
|
| 1999 | 1 |
12.5%
|
|
| 2002 | 1 |
12.5%
|
|
| 2005 | 2 |
25%
|
|
| 2006 | 1 |
12.5%
|
|
| 2007 | 2 |
25%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 10362 |