| Value | Category | Cases | |
|---|---|---|---|
| 1979 | 1 |
5%
|
|
| 1988 | 1 |
5%
|
|
| 1992 | 1 |
5%
|
|
| 1995 | 1 |
5%
|
|
| 2222 | Not asked in Phase 2 | 0 |
0%
|
| 3333 | Missing | 0 |
0%
|
| 5555 | Not Applicable | 0 |
0%
|
| 8888 | Refused | 0 |
0%
|
| 9999 | Don't know | 16 |
80%
|
| Sysmiss | 21854 |