| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 6 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    
| 0 | No time was spent | 79 | 
                                                                 
                                    
                                    69.3%
                                 
                                                             | 
                                                        
                    
| 1 | 5 | 
                                                                 
                                    
                                    4.4%
                                 
                                                             | 
                                                        
                    |
| 2 | 2 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    |
| 3 | 2 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    |
| 5 | 1 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 8 | 1 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 10 | 6 | 
                                                                 
                                    
                                    5.3%
                                 
                                                             | 
                                                        
                    |
| 12 | 1 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 14 | 1 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 15 | 1 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 20 | 5 | 
                                                                 
                                    
                                    4.4%
                                 
                                                             | 
                                                        
                    |
| 23 | 1 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 25 | 1 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 30 | 1 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             | 
                                                        
                    |
| 40 | 1 | 
                                                                 
                                    
                                    0.9%
                                 
                                                             |