| Value |
Category |
| 1 |
Never |
| 2 |
Monthly |
| 3 |
Quarterly |
| 4 |
Bi-Annually |
| 5 |
Annually |
| 6 |
Ad hoc |
| 7 |
Don't know |
| 9 |
Missing value |
Warning: these figures indicate the number of cases found in the data file. They cannot be interpreted as summary statistics of the population of interest.