| Value | Category | Cases | |
|---|---|---|---|
| 2010 | 14 | 
                                    
                                    5%
                                 | |
| 2011 | 264 | 
                                    
                                    95%
                                 | |
| 9998 | nsp | 0 | 
                                    
                                    0%
                                 | 
| 9999 | manquant | 0 | 
                                    
                                    0%
                                 | 
| Sysmiss | 3690 |