| value | category | cases | |
|---|---|---|---|
| 1999 | 7 |
20%
|
|
| 2000 | 17 |
48.6%
|
|
| 2001 | 7 |
20%
|
|
| 2002 | 3 |
8.6%
|
|
| 2003 | 1 |
2.9%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 12442 |