| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 0 |
0%
|
| -8 | Refusal (spontaneous) | 0 |
0%
|
| -7 | Does not apply | 0 |
0%
|
| 1 | One year or less | 1 |
20%
|
| 5 | 1 |
20%
|
|
| 9 | 1 |
20%
|
|
| 20 | 2 |
40%
|
|
| Sysmiss | 357 |