| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 35 | 
                                    
                                    5.7%
                                 | 
| 0 | No time was spent | 372 | 
                                    
                                    60.8%
                                 | 
| 1 | 36 | 
                                    
                                    5.9%
                                 | |
| 2 | 7 | 
                                    
                                    1.1%
                                 | |
| 3 | 2 | 
                                    
                                    0.3%
                                 | |
| 4 | 7 | 
                                    
                                    1.1%
                                 | |
| 5 | 21 | 
                                    
                                    3.4%
                                 | |
| 6 | 2 | 
                                    
                                    0.3%
                                 | |
| 8 | 1 | 
                                    
                                    0.2%
                                 | |
| 10 | 34 | 
                                    
                                    5.6%
                                 | |
| 15 | 5 | 
                                    
                                    0.8%
                                 | |
| 16 | 2 | 
                                    
                                    0.3%
                                 | |
| 17 | 1 | 
                                    
                                    0.2%
                                 | |
| 18 | 1 | 
                                    
                                    0.2%
                                 | |
| 20 | 23 | 
                                    
                                    3.8%
                                 | |
| 24 | 2 | 
                                    
                                    0.3%
                                 | |
| 25 | 1 | 
                                    
                                    0.2%
                                 | |
| 30 | 10 | 
                                    
                                    1.6%
                                 | |
| 40 | 6 | 
                                    
                                    1%
                                 | |
| 47 | 1 | 
                                    
                                    0.2%
                                 | |
| 50 | 9 | 
                                    
                                    1.5%
                                 | |
| 53 | 1 | 
                                    
                                    0.2%
                                 | |
| 60 | 1 | 
                                    
                                    0.2%
                                 | |
| 70 | 1 | 
                                    
                                    0.2%
                                 | |
| 75 | 2 | 
                                    
                                    0.3%
                                 | |
| 80 | 4 | 
                                    
                                    0.7%
                                 | |
| 90 | 2 | 
                                    
                                    0.3%
                                 | |
| 95 | 1 | 
                                    
                                    0.2%
                                 | |
| 99 | 1 | 
                                    
                                    0.2%
                                 | |
| 100 | 21 | 
                                    
                                    3.4%
                                 |