| Value | Category | Cases | |
|---|---|---|---|
| 99 | Don't Know | 0 |
0%
|
| 1999 | 8 |
13.3%
|
|
| 2000 | 9 |
15%
|
|
| 2001 | 14 |
23.3%
|
|
| 2002 | 13 |
21.7%
|
|
| 2003 | 10 |
16.7%
|
|
| 2004 | 6 |
10%
|
|
| Sysmiss | 1496 |