| Value | Category | Cases | |
|---|---|---|---|
| 1 | Everyday | 2315 | 
                                
                                6.6%
                             | 
| 2 | Once a week | 154 | 
                                
                                0.4%
                             | 
| 3 | Once a month | 3843 | 
                                
                                10.9%
                             | 
| 4 | Once a term | 6494 | 
                                
                                18.5%
                             | 
| 5 | Once a year | 3339 | 
                                
                                9.5%
                             | 
| 6 | Unspecified | 518 | 
                                
                                1.5%
                             | 
| 95 | Missing | 10 | 
                                
                                0%
                             | 
| 98 | Don't know | 37 | 
                                
                                0.1%
                             | 
| 99 | NA | 18479 | 
                                
                                52.5%
                             |