| Value | Category | Cases | |
|---|---|---|---|
| -95 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 1995 | 1 | 
                                    
                                    0.5%
                                 | |
| 2005 | 20 | 
                                    
                                    10.2%
                                 | |
| 2006 | 85 | 
                                    
                                    43.4%
                                 | |
| 2007 | 6 | 
                                    
                                    3.1%
                                 | |
| 2008 | 1 | 
                                    
                                    0.5%
                                 | |
| 2009 | 5 | 
                                    
                                    2.6%
                                 | |
| 2010 | 65 | 
                                    
                                    33.2%
                                 | |
| 2011 | 13 | 
                                    
                                    6.6%
                                 | |
| Sysmiss | 14 |