| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 3 | 
                                    
                                    0%
                                 | |
| 1981 | 2 | 
                                    
                                    0%
                                 | |
| 1982 | 7 | 
                                    
                                    0%
                                 | |
| 1983 | 7 | 
                                    
                                    0%
                                 | |
| 1984 | 18 | 
                                    
                                    0.1%
                                 | |
| 1985 | 42 | 
                                    
                                    0.2%
                                 | |
| 1986 | 52 | 
                                    
                                    0.3%
                                 | |
| 1987 | 70 | 
                                    
                                    0.4%
                                 | |
| 1988 | 125 | 
                                    
                                    0.7%
                                 | |
| 1989 | 191 | 
                                    
                                    1%
                                 | |
| 1990 | 265 | 
                                    
                                    1.4%
                                 | |
| 1991 | 290 | 
                                    
                                    1.6%
                                 | |
| 1992 | 272 | 
                                    
                                    1.5%
                                 | |
| 1993 | 352 | 
                                    
                                    1.9%
                                 | |
| 1994 | 415 | 
                                    
                                    2.2%
                                 | |
| 1995 | 466 | 
                                    
                                    2.5%
                                 | |
| 1996 | 401 | 
                                    
                                    2.2%
                                 | |
| 1997 | 430 | 
                                    
                                    2.3%
                                 | |
| 1998 | 438 | 
                                    
                                    2.4%
                                 | |
| 1999 | 495 | 
                                    
                                    2.7%
                                 | |
| 2000 | 559 | 
                                    
                                    3%
                                 | |
| 2001 | 564 | 
                                    
                                    3%
                                 | |
| 2002 | 588 | 
                                    
                                    3.2%
                                 | |
| 2003 | 593 | 
                                    
                                    3.2%
                                 | |
| 2004 | 792 | 
                                    
                                    4.3%
                                 | |
| 2005 | 947 | 
                                    
                                    5.1%
                                 | |
| 2006 | 934 | 
                                    
                                    5%
                                 | |
| 2007 | 867 | 
                                    
                                    4.7%
                                 | |
| 2008 | 875 | 
                                    
                                    4.7%
                                 | |
| 2009 | 863 | 
                                    
                                    4.6%
                                 | |
| 2010 | 914 | 
                                    
                                    4.9%
                                 | |
| 2011 | 872 | 
                                    
                                    4.7%
                                 | |
| 2012 | 772 | 
                                    
                                    4.2%
                                 | |
| 2013 | 750 | 
                                    
                                    4%
                                 | |
| 2014 | 828 | 
                                    
                                    4.5%
                                 | |
| 2015 | 768 | 
                                    
                                    4.1%
                                 | |
| 2016 | 746 | 
                                    
                                    4%
                                 | |
| 2017 | 775 | 
                                    
                                    4.2%
                                 | |
| 2018 | 215 | 
                                    
                                    1.2%
                                 | |
| 9999 | NO RESPONSE | 5 | 
                                    
                                    0%
                                 | 
| Sysmiss | 12492 |