| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 93 | 
                                    
                                    6.6%
                                 | 
| 0 | No time was spent | 818 | 
                                    
                                    57.8%
                                 | 
| 1 | 19 | 
                                    
                                    1.3%
                                 | |
| 2 | 21 | 
                                    
                                    1.5%
                                 | |
| 3 | 18 | 
                                    
                                    1.3%
                                 | |
| 4 | 1 | 
                                    
                                    0.1%
                                 | |
| 5 | 51 | 
                                    
                                    3.6%
                                 | |
| 6 | 22 | 
                                    
                                    1.6%
                                 | |
| 7 | 7 | 
                                    
                                    0.5%
                                 | |
| 8 | 24 | 
                                    
                                    1.7%
                                 | |
| 9 | 7 | 
                                    
                                    0.5%
                                 | |
| 10 | 88 | 
                                    
                                    6.2%
                                 | |
| 12 | 14 | 
                                    
                                    1%
                                 | |
| 14 | 3 | 
                                    
                                    0.2%
                                 | |
| 15 | 23 | 
                                    
                                    1.6%
                                 | |
| 20 | 52 | 
                                    
                                    3.7%
                                 | |
| 24 | 2 | 
                                    
                                    0.1%
                                 | |
| 25 | 6 | 
                                    
                                    0.4%
                                 | |
| 30 | 36 | 
                                    
                                    2.5%
                                 | |
| 35 | 1 | 
                                    
                                    0.1%
                                 | |
| 40 | 13 | 
                                    
                                    0.9%
                                 | |
| 45 | 2 | 
                                    
                                    0.1%
                                 | |
| 48 | 2 | 
                                    
                                    0.1%
                                 | |
| 50 | 27 | 
                                    
                                    1.9%
                                 | |
| 60 | 7 | 
                                    
                                    0.5%
                                 | |
| 70 | 8 | 
                                    
                                    0.6%
                                 | |
| 80 | 15 | 
                                    
                                    1.1%
                                 | |
| 85 | 2 | 
                                    
                                    0.1%
                                 | |
| 90 | 6 | 
                                    
                                    0.4%
                                 | |
| 95 | 1 | 
                                    
                                    0.1%
                                 | |
| 100 | 27 | 
                                    
                                    1.9%
                                 |