| Value | Category | Cases | |
|---|---|---|---|
| -99 | Don't know | 12 |
15.6%
|
| -96 | Other | 9 |
11.7%
|
| 1 | Every month | 8 |
10.4%
|
| 2 | Every 3 months | 2 |
2.6%
|
| 3 | Every 6 months | 5 |
6.5%
|
| 4 | Every 12 months | 31 |
40.3%
|
| 5 | One time only | 10 |
13%
|
| Sysmiss | 109 |