| Value | Category | Cases | |
|---|---|---|---|
| 99 | Don't Know | 0 |
0%
|
| 1999 | 1 |
0.3%
|
|
| 2000 | 6 |
1.8%
|
|
| 2001 | 75 |
22.5%
|
|
| 2002 | 120 |
35.9%
|
|
| 2003 | 104 |
31.1%
|
|
| 2004 | 28 |
8.4%
|
|
| Sysmiss | 1222 |