| Value | Category | Cases | |
|---|---|---|---|
| 1 | On a monthly basis | 5677 | 
                                                                 
                                    
                                    45.5%
                                 
                                                             | 
                                                        
                    
| 2 | Sometine (more than 2 months past 2 months) | 4039 | 
                                                                 
                                    
                                    32.4%
                                 
                                                             | 
                                                        
                    
| 3 | Rarely (less than 2 months) | 1061 | 
                                                                 
                                    
                                    8.5%
                                 
                                                             | 
                                                        
                    
| 4 | Never | 1703 | 
                                                                 
                                    
                                    13.6%
                                 
                                                             |