| Value | Category | Cases | |
|---|---|---|---|
| 2000 | 212 | 
                                    
                                    3.6%
                                 | |
| 2001 | 258 | 
                                    
                                    4.4%
                                 | |
| 2002 | 354 | 
                                    
                                    6.1%
                                 | |
| 2003 | 387 | 
                                    
                                    6.6%
                                 | |
| 2004 | 348 | 
                                    
                                    5.9%
                                 | |
| 2005 | 411 | 
                                    
                                    7%
                                 | |
| 2006 | 369 | 
                                    
                                    6.3%
                                 | |
| 2007 | 420 | 
                                    
                                    7.2%
                                 | |
| 2008 | 492 | 
                                    
                                    8.4%
                                 | |
| 2009 | 523 | 
                                    
                                    8.9%
                                 | |
| 2010 | 552 | 
                                    
                                    9.4%
                                 | |
| 2011 | 638 | 
                                    
                                    10.9%
                                 | |
| 2012 | 625 | 
                                    
                                    10.7%
                                 | |
| 2013 | 125 | 
                                    
                                    2.1%
                                 | |
| 9998 | DK | 2 | 
                                    
                                    0%
                                 | 
| Sysmiss | 134 | 
                                    
                                    2.3%
                                 |