| Value | Category | Cases | |
|---|---|---|---|
| 1 | Everyday | 1228 | 
                                
                                3.5%
                             | 
| 2 | Once a week | 2892 | 
                                
                                8.2%
                             | 
| 3 | Once a month | 4431 | 
                                
                                12.6%
                             | 
| 4 | Once a term | 2589 | 
                                
                                7.4%
                             | 
| 5 | Once a year | 550 | 
                                
                                1.6%
                             | 
| 6 | Unspecified | 435 | 
                                
                                1.2%
                             | 
| 95 | Missing | 12 | 
                                
                                0%
                             | 
| 98 | Don't know | 23 | 
                                
                                0.1%
                             | 
| 99 | NA | 23029 | 
                                
                                65.4%
                             |