| Value | Category | Cases | |
|---|---|---|---|
| 2001 | 3 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    |
| 2002 | 4 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| 2003 | 2 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 2004 | 4 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| 2005 | 7 | 
                                                                 
                                    
                                    3.6%
                                 
                                                             | 
                                                        
                    |
| 2006 | 3 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    |
| 2007 | 5 | 
                                                                 
                                    
                                    2.6%
                                 
                                                             | 
                                                        
                    |
| 2008 | 6 | 
                                                                 
                                    
                                    3.1%
                                 
                                                             | 
                                                        
                    |
| 2009 | 8 | 
                                                                 
                                    
                                    4.2%
                                 
                                                             | 
                                                        
                    |
| 2010 | 12 | 
                                                                 
                                    
                                    6.3%
                                 
                                                             | 
                                                        
                    |
| 2011 | 17 | 
                                                                 
                                    
                                    8.9%
                                 
                                                             | 
                                                        
                    |
| 2012 | 29 | 
                                                                 
                                    
                                    15.1%
                                 
                                                             | 
                                                        
                    |
| 2013 | 36 | 
                                                                 
                                    
                                    18.8%
                                 
                                                             | 
                                                        
                    |
| 2014 | 34 | 
                                                                 
                                    
                                    17.7%
                                 
                                                             | 
                                                        
                    |
| 2015 | 22 | 
                                                                 
                                    
                                    11.5%
                                 
                                                             | 
                                                        
                    |
| 9997 | inconsistent | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 9998 | don't know | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| Sysmiss | 6289 |