| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1999 | 7 | 8 |
1.2%
|
|
| 2000 | 101 | 102 |
15.7%
|
|
| 2001 | 144 | 144 |
22.3%
|
|
| 2002 | 252 | 244 |
37.7%
|
|
| 2003 | 143 | 144 |
22.3%
|
|
| 9997 | inconsistent | 6 | 5 |
0.7%
|
| 9998 | dk | 0 | 0 |
0%
|
| Sysmiss | 2640 | 2646 |