| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 13 | 
                                                                 
                                    
                                    3.4%
                                 
                                                             | 
                                                        
                    
| 0 | No time was spent | 100 | 
                                                                 
                                    
                                    25.8%
                                 
                                                             | 
                                                        
                    
| 1 | 26 | 
                                                                 
                                    
                                    6.7%
                                 
                                                             | 
                                                        
                    |
| 2 | 4 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 3 | 7 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    |
| 4 | 6 | 
                                                                 
                                    
                                    1.5%
                                 
                                                             | 
                                                        
                    |
| 5 | 55 | 
                                                                 
                                    
                                    14.2%
                                 
                                                             | 
                                                        
                    |
| 6 | 22 | 
                                                                 
                                    
                                    5.7%
                                 
                                                             | 
                                                        
                    |
| 7 | 9 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    |
| 8 | 2 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 10 | 137 | 
                                                                 
                                    
                                    35.3%
                                 
                                                             | 
                                                        
                    |
| 15 | 4 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 24 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 30 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 50 | 1 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             |