| value | category | cases | |
|---|---|---|---|
| 1998 | 1 |
1.7%
|
|
| 1999 | 9 |
15%
|
|
| 2000 | 10 |
16.7%
|
|
| 2001 | 7 |
11.7%
|
|
| 2002 | 13 |
21.7%
|
|
| 2003 | 20 |
33.3%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 9037 |