| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 7 | 
                                    
                                    0.3%
                                 | |
| 2001 | 103 | 
                                    
                                    4.5%
                                 | |
| 2002 | 113 | 
                                    
                                    5%
                                 | |
| 2003 | 126 | 
                                    
                                    5.5%
                                 | |
| 2004 | 180 | 
                                    
                                    7.9%
                                 | |
| 2005 | 138 | 
                                    
                                    6.1%
                                 | |
| 2006 | 169 | 
                                    
                                    7.4%
                                 | |
| 2007 | 152 | 
                                    
                                    6.7%
                                 | |
| 2008 | 177 | 
                                    
                                    7.8%
                                 | |
| 2009 | 188 | 
                                    
                                    8.3%
                                 | |
| 2010 | 197 | 
                                    
                                    8.7%
                                 | |
| 2011 | 257 | 
                                    
                                    11.3%
                                 | |
| 2012 | 244 | 
                                    
                                    10.7%
                                 | |
| 2013 | 207 | 
                                    
                                    9.1%
                                 | |
| 9998 | DK | 3 | 
                                    
                                    0.1%
                                 | 
| Sysmiss | 11 | 
                                    
                                    0.5%
                                 |