| Value | Category | Cases | |
|---|---|---|---|
| 1 | Never | 1882 |
60.7%
|
| 2 | This year | 867 |
27.9%
|
| 3 | Last year | 201 |
6.5%
|
| 4 | 2 years ago | 78 |
2.5%
|
| 5 | 3 years ago | 20 |
0.6%
|
| 6 | More than 3 years ago | 54 |
1.7%
|
| Sysmiss | 11 |