| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 11 | 
                                    
                                    3%
                                 | 
| 0 | No time was spent | 153 | 
                                    
                                    42.1%
                                 | 
| 1 | 18 | 
                                    
                                    5%
                                 | |
| 2 | 7 | 
                                    
                                    1.9%
                                 | |
| 3 | 6 | 
                                    
                                    1.7%
                                 | |
| 4 | 3 | 
                                    
                                    0.8%
                                 | |
| 5 | 19 | 
                                    
                                    5.2%
                                 | |
| 7 | 1 | 
                                    
                                    0.3%
                                 | |
| 8 | 3 | 
                                    
                                    0.8%
                                 | |
| 10 | 32 | 
                                    
                                    8.8%
                                 | |
| 13 | 1 | 
                                    
                                    0.3%
                                 | |
| 14 | 1 | 
                                    
                                    0.3%
                                 | |
| 15 | 3 | 
                                    
                                    0.8%
                                 | |
| 20 | 21 | 
                                    
                                    5.8%
                                 | |
| 24 | 1 | 
                                    
                                    0.3%
                                 | |
| 30 | 15 | 
                                    
                                    4.1%
                                 | |
| 40 | 9 | 
                                    
                                    2.5%
                                 | |
| 50 | 11 | 
                                    
                                    3%
                                 | |
| 60 | 3 | 
                                    
                                    0.8%
                                 | |
| 70 | 5 | 
                                    
                                    1.4%
                                 | |
| 80 | 6 | 
                                    
                                    1.7%
                                 | |
| 90 | 2 | 
                                    
                                    0.6%
                                 | |
| 95 | 1 | 
                                    
                                    0.3%
                                 | |
| 100 | 31 | 
                                    
                                    8.5%
                                 |