| Value | Category | Cases | Weighted | |
|---|---|---|---|---|
| 1999 | 7 | 9 |
1.5%
|
|
| 2000 | 96 | 92 |
15.3%
|
|
| 2001 | 136 | 139 |
22.9%
|
|
| 2002 | 240 | 227 |
37.5%
|
|
| 2003 | 131 | 137 |
22.7%
|
|
| 9997 | inconsistent | 2 | 0 |
0.1%
|
| 9998 | dk | 0 | 0 |
0%
|
| Sysmiss | 2681 | 2689 |