| Value | Category | Cases | |
|---|---|---|---|
| 99 | Don't Know | 0 |
0%
|
| 2000 | 1 |
0.2%
|
|
| 2001 | 21 |
4.2%
|
|
| 2002 | 231 |
46.2%
|
|
| 2003 | 177 |
35.4%
|
|
| 2004 | 70 |
14%
|
|
| Sysmiss | 1056 |