| Value | Category | Cases | |
|---|---|---|---|
| 1 | Once | 12879 |
96%
|
| 2 | Twice | 449 |
3.3%
|
| 3 | Three times | 73 |
0.5%
|
| 4 | Four times or more | 8 |
0.1%
|
| 98 | Don't Know | 6 |
0%
|
| Sysmiss | 20035 |