| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 26 | 
                                                                 
                                    
                                    7.1%
                                 
                                                             | 
                                                        
                    
| 0 | No time was spent | 82 | 
                                                                 
                                    
                                    22.5%
                                 
                                                             | 
                                                        
                    
| 1 | 59 | 
                                                                 
                                    
                                    16.2%
                                 
                                                             | 
                                                        
                    |
| 2 | 32 | 
                                                                 
                                    
                                    8.8%
                                 
                                                             | 
                                                        
                    |
| 3 | 4 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 4 | 6 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    |
| 5 | 61 | 
                                                                 
                                    
                                    16.8%
                                 
                                                             | 
                                                        
                    |
| 10 | 58 | 
                                                                 
                                    
                                    15.9%
                                 
                                                             | 
                                                        
                    |
| 12 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 15 | 12 | 
                                                                 
                                    
                                    3.3%
                                 
                                                             | 
                                                        
                    |
| 20 | 9 | 
                                                                 
                                    
                                    2.5%
                                 
                                                             | 
                                                        
                    |
| 25 | 2 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 30 | 3 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 48 | 3 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 60 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 72 | 4 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 96 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             |