| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 518 |
51.6%
|
| 2 | This period | 201 |
20%
|
| 3 | Last period | 131 |
13.1%
|
| 4 | 2 periods ago | 48 |
4.8%
|
| 5 | 3 terms ago | 38 |
3.8%
|
| 6 | More than a year ago | 67 |
6.7%
|
| Sysmiss | 15 |