| Value | Category | Cases | |
|---|---|---|---|
| 99 | ND | 0 | 
                                    
                                    0%
                                 | 
| 1989 | 1 | 
                                    
                                    1.8%
                                 | |
| 1990 | 2 | 
                                    
                                    3.5%
                                 | |
| 1995 | 2 | 
                                    
                                    3.5%
                                 | |
| 1996 | 2 | 
                                    
                                    3.5%
                                 | |
| 1997 | 1 | 
                                    
                                    1.8%
                                 | |
| 1998 | 1 | 
                                    
                                    1.8%
                                 | |
| 2000 | 4 | 
                                    
                                    7%
                                 | |
| 2002 | 4 | 
                                    
                                    7%
                                 | |
| 2003 | 1 | 
                                    
                                    1.8%
                                 | |
| 2004 | 1 | 
                                    
                                    1.8%
                                 | |
| 2005 | 5 | 
                                    
                                    8.8%
                                 | |
| 2006 | 3 | 
                                    
                                    5.3%
                                 | |
| 2007 | 3 | 
                                    
                                    5.3%
                                 | |
| 2008 | 1 | 
                                    
                                    1.8%
                                 | |
| 2009 | 2 | 
                                    
                                    3.5%
                                 | |
| 2010 | 9 | 
                                    
                                    15.8%
                                 | |
| 2011 | 7 | 
                                    
                                    12.3%
                                 | |
| 2012 | 2 | 
                                    
                                    3.5%
                                 | |
| 2013 | 6 | 
                                    
                                    10.5%
                                 | |
| Sysmiss | 1443 |