| Value | Category | Cases | |
|---|---|---|---|
| 1991 | 1 | 
                                    
                                    0%
                                 | |
| 1995 | 1 | 
                                    
                                    0%
                                 | |
| 1996 | 2 | 
                                    
                                    0%
                                 | |
| 1997 | 1 | 
                                    
                                    0%
                                 | |
| 1998 | 1 | 
                                    
                                    0%
                                 | |
| 1999 | 5 | 
                                    
                                    0.1%
                                 | |
| 2000 | 2 | 
                                    
                                    0%
                                 | |
| 2001 | 4 | 
                                    
                                    0.1%
                                 | |
| 2002 | 7 | 
                                    
                                    0.2%
                                 | |
| 2003 | 5 | 
                                    
                                    0.1%
                                 | |
| 2004 | 8 | 
                                    
                                    0.2%
                                 | |
| 2005 | 7 | 
                                    
                                    0.2%
                                 | |
| 2006 | 1 | 
                                    
                                    0%
                                 | |
| 2007 | 3 | 
                                    
                                    0.1%
                                 | |
| 2008 | 7 | 
                                    
                                    0.2%
                                 | |
| 2009 | 8 | 
                                    
                                    0.2%
                                 | |
| 2010 | 9 | 
                                    
                                    0.2%
                                 | |
| 2011 | 22 | 
                                    
                                    0.5%
                                 | |
| 2012 | 30 | 
                                    
                                    0.7%
                                 | |
| 2013 | 30 | 
                                    
                                    0.7%
                                 | |
| 2014 | 83 | 
                                    
                                    2%
                                 | |
| 2015 | 76 | 
                                    
                                    1.8%
                                 | |
| 2016 | 84 | 
                                    
                                    2%
                                 | |
| 2017 | 128 | 
                                    
                                    3%
                                 | |
| 2018 | 266 | 
                                    
                                    6.3%
                                 | |
| 9998 | DK / DON?T REMEMBER | 1 | 
                                    
                                    0%
                                 | 
| Sysmiss | 3443 | 
                                    
                                    81.3%
                                 |