| Value | Category | Cases | |
|---|---|---|---|
| 0 | 1 | 
                                    
                                    1.2%
                                 | |
| 1 | Decreased since 2002 | 4 | 
                                    
                                    4.9%
                                 | 
| 2 | No change | 52 | 
                                    
                                    63.4%
                                 | 
| 3 | Increased since 2002 | 25 | 
                                    
                                    30.5%
                                 | 
| -9 | 21 | ||
| -7 | 30 |