| Value | Category | Cases | |
|---|---|---|---|
| 1 | Everyday | 31 | 
                                
                                0.1%
                             | 
| 2 | Once a week | 29 | 
                                
                                0.1%
                             | 
| 3 | Once a month | 689 | 
                                
                                2%
                             | 
| 4 | Once a term | 7218 | 
                                
                                20.5%
                             | 
| 5 | Once a year | 7532 | 
                                
                                21.4%
                             | 
| 6 | Unspecified | 5988 | 
                                
                                17%
                             | 
| 95 | Missing | 17 | 
                                
                                0%
                             | 
| 96 | 1 | 
                                
                                0%
                             | |
| 98 | Don't know | 14 | 
                                
                                0%
                             | 
| 99 | NA | 13670 | 
                                
                                38.8%
                             |