| Value | Category | Cases | |
|---|---|---|---|
| 1 | 4 | 
                                    
                                    0.5%
                                 | |
| 2 | 55 | 
                                    
                                    6.8%
                                 | |
| 3 | 316 | 
                                    
                                    38.9%
                                 | |
| 4 | 315 | 
                                    
                                    38.7%
                                 | |
| 5 | 6 | 
                                    
                                    0.7%
                                 | |
| 6 | 104 | 
                                    
                                    12.8%
                                 | |
| 7 | 13 | 
                                    
                                    1.6%
                                 | |
| Sysmiss | 2007 |