| Value | Category | Cases | |
|---|---|---|---|
| -98 | Don't know | 0 | |
| 1 | Once | 2 |
0.5%
|
| 2 | Twice | 3 |
0.7%
|
| 3 | Three times | 155 |
35.7%
|
| 4 | Four times | 274 |
63.1%
|
| a | Not applicable | 0 | |
| b | Don't know | 0 | |
| c | Refused to respond | 0 |