| Value | Category | Cases | |
|---|---|---|---|
| 1 | Much more than normal | 18 | 
                                    
                                    5.2%
                                 | 
| 2 | Somewhat higher than usual | 169 | 
                                    
                                    49.3%
                                 | 
| 3 | Normal | 131 | 
                                    
                                    38.2%
                                 | 
| 4 | Less than normal | 24 | 
                                    
                                    7%
                                 | 
| 5 | Much less than normal | 1 | 
                                    
                                    0.3%
                                 |