| Value | Category | Cases | |
|---|---|---|---|
| 1982 | 1 | 
                                    
                                    0%
                                 | |
| 1983 | 1 | 
                                    
                                    0%
                                 | |
| 1984 | 1 | 
                                    
                                    0%
                                 | |
| 1986 | 2 | 
                                    
                                    0%
                                 | |
| 1987 | 2 | 
                                    
                                    0%
                                 | |
| 1988 | 3 | 
                                    
                                    0%
                                 | |
| 1989 | 1 | 
                                    
                                    0%
                                 | |
| 1990 | 4 | 
                                    
                                    0%
                                 | |
| 1991 | 6 | 
                                    
                                    0%
                                 | |
| 1992 | 12 | 
                                    
                                    0.1%
                                 | |
| 1993 | 16 | 
                                    
                                    0.1%
                                 | |
| 1994 | 19 | 
                                    
                                    0.1%
                                 | |
| 1995 | 29 | 
                                    
                                    0.2%
                                 | |
| 1996 | 26 | 
                                    
                                    0.1%
                                 | |
| 1997 | 51 | 
                                    
                                    0.3%
                                 | |
| 1998 | 65 | 
                                    
                                    0.4%
                                 | |
| 1999 | 61 | 
                                    
                                    0.3%
                                 | |
| 2000 | 106 | 
                                    
                                    0.6%
                                 | |
| 2001 | 129 | 
                                    
                                    0.7%
                                 | |
| 2002 | 153 | 
                                    
                                    0.8%
                                 | |
| 2003 | 206 | 
                                    
                                    1.1%
                                 | |
| 2004 | 289 | 
                                    
                                    1.6%
                                 | |
| 2005 | 323 | 
                                    
                                    1.7%
                                 | |
| 2006 | 399 | 
                                    
                                    2.1%
                                 | |
| 2007 | 431 | 
                                    
                                    2.3%
                                 | |
| 2008 | 491 | 
                                    
                                    2.6%
                                 | |
| 2009 | 634 | 
                                    
                                    3.4%
                                 | |
| 2010 | 841 | 
                                    
                                    4.5%
                                 | |
| 2011 | 952 | 
                                    
                                    5.1%
                                 | |
| 2012 | 1179 | 
                                    
                                    6.3%
                                 | |
| 2013 | 1409 | 
                                    
                                    7.6%
                                 | |
| 2014 | 1740 | 
                                    
                                    9.4%
                                 | |
| 2015 | 2133 | 
                                    
                                    11.5%
                                 | |
| 2016 | 2681 | 
                                    
                                    14.4%
                                 | |
| 2017 | 3274 | 
                                    
                                    17.6%
                                 | |
| 2018 | 896 | 
                                    
                                    4.8%
                                 | |
| 9999 | NO RESPONSE | 2 | 
                                    
                                    0%
                                 | 
| Sysmiss | 12492 |