| Value | Category | Cases | |
|---|---|---|---|
| 1988 | 1 | 
                                    
                                    0%
                                 | |
| 1989 | 1 | 
                                    
                                    0%
                                 | |
| 1992 | 2 | 
                                    
                                    0.1%
                                 | |
| 1994 | 2 | 
                                    
                                    0.1%
                                 | |
| 1995 | 1 | 
                                    
                                    0%
                                 | |
| 1996 | 5 | 
                                    
                                    0.2%
                                 | |
| 1997 | 5 | 
                                    
                                    0.2%
                                 | |
| 1998 | 11 | 
                                    
                                    0.5%
                                 | |
| 1999 | 5 | 
                                    
                                    0.2%
                                 | |
| 2000 | 9 | 
                                    
                                    0.4%
                                 | |
| 2001 | 11 | 
                                    
                                    0.5%
                                 | |
| 2002 | 10 | 
                                    
                                    0.5%
                                 | |
| 2003 | 14 | 
                                    
                                    0.7%
                                 | |
| 2004 | 11 | 
                                    
                                    0.5%
                                 | |
| 2005 | 20 | 
                                    
                                    0.9%
                                 | |
| 2006 | 27 | 
                                    
                                    1.3%
                                 | |
| 2007 | 20 | 
                                    
                                    0.9%
                                 | |
| 2008 | 29 | 
                                    
                                    1.3%
                                 | |
| 2009 | 15 | 
                                    
                                    0.7%
                                 | |
| 2010 | 51 | 
                                    
                                    2.4%
                                 | |
| 2011 | 76 | 
                                    
                                    3.5%
                                 | |
| 2012 | 68 | 
                                    
                                    3.2%
                                 | |
| 2013 | 72 | 
                                    
                                    3.3%
                                 | |
| 2014 | 98 | 
                                    
                                    4.6%
                                 | |
| 2015 | 106 | 
                                    
                                    4.9%
                                 | |
| 2016 | 132 | 
                                    
                                    6.1%
                                 | |
| 2017 | 200 | 
                                    
                                    9.3%
                                 | |
| 2018 | 171 | 
                                    
                                    7.9%
                                 | |
| 2019 | 4 | 
                                    
                                    0.2%
                                 | |
| 9999 | NO RESPONSE | 1 | 
                                    
                                    0%
                                 | 
| Sysmiss | 975 | 
                                    
                                    45.3%
                                 |