| value | category | cases | |
|---|---|---|---|
| 1999 | 4 |
30.8%
|
|
| 2000 | 1 |
7.7%
|
|
| 2001 | 3 |
23.1%
|
|
| 2002 | 3 |
23.1%
|
|
| 2003 | 2 |
15.4%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 9084 |