| More than once a year | 10 % |
| Annually | 17 % |
| Every 2-3 years | 2 % |
| Infrequently | 19 % |
| Never | 52 % |
| Total | 128 |
| More than once a year | 10 % |
| Annually | 17 % |
| Every 2-3 years | 2 % |
| Infrequently | 19 % |
| Never | 52 % |
| Total | 128 |