| Value | Category | Cases | |
|---|---|---|---|
| 0-3 months ago | 17 | 
                                                                 
                                    
                                    11.6%
                                 
                                                             | 
                                                        
                    |
| 3-6 months ago | 23 | 
                                                                 
                                    
                                    15.6%
                                 
                                                             | 
                                                        
                    |
| 6-12 months ago | 35 | 
                                                                 
                                    
                                    23.8%
                                 
                                                             | 
                                                        
                    |
| I don't know | 12 | 
                                                                 
                                    
                                    8.2%
                                 
                                                             | 
                                                        
                    |
| Many years ago/I can't remember | 22 | 
                                                                 
                                    
                                    15%
                                 
                                                             | 
                                                        
                    |
| More than one year ago | 38 | 
                                                                 
                                    
                                    25.9%
                                 
                                                             |