| Value | Category | Cases | |
|---|---|---|---|
| 1982 | 1 | 
                                    
                                    0%
                                 | |
| 1983 | 1 | 
                                    
                                    0%
                                 | |
| 1985 | 1 | 
                                    
                                    0%
                                 | |
| 1986 | 8 | 
                                    
                                    0%
                                 | |
| 1987 | 17 | 
                                    
                                    0.1%
                                 | |
| 1988 | 34 | 
                                    
                                    0.1%
                                 | |
| 1989 | 79 | 
                                    
                                    0.3%
                                 | |
| 1990 | 160 | 
                                    
                                    0.6%
                                 | |
| 1991 | 215 | 
                                    
                                    0.8%
                                 | |
| 1992 | 271 | 
                                    
                                    1.1%
                                 | |
| 1993 | 369 | 
                                    
                                    1.4%
                                 | |
| 1994 | 396 | 
                                    
                                    1.6%
                                 | |
| 1995 | 462 | 
                                    
                                    1.8%
                                 | |
| 1996 | 519 | 
                                    
                                    2%
                                 | |
| 1997 | 493 | 
                                    
                                    1.9%
                                 | |
| 1998 | 582 | 
                                    
                                    2.3%
                                 | |
| 1999 | 625 | 
                                    
                                    2.5%
                                 | |
| 2000 | 765 | 
                                    
                                    3%
                                 | |
| 2001 | 699 | 
                                    
                                    2.7%
                                 | |
| 2002 | 783 | 
                                    
                                    3.1%
                                 | |
| 2003 | 875 | 
                                    
                                    3.4%
                                 | |
| 2004 | 854 | 
                                    
                                    3.4%
                                 | |
| 2005 | 992 | 
                                    
                                    3.9%
                                 | |
| 2006 | 931 | 
                                    
                                    3.7%
                                 | |
| 2007 | 1065 | 
                                    
                                    4.2%
                                 | |
| 2008 | 989 | 
                                    
                                    3.9%
                                 | |
| 2009 | 1096 | 
                                    
                                    4.3%
                                 | |
| 2010 | 1171 | 
                                    
                                    4.6%
                                 | |
| 2011 | 1152 | 
                                    
                                    4.5%
                                 | |
| 2012 | 1158 | 
                                    
                                    4.5%
                                 | |
| 2013 | 1121 | 
                                    
                                    4.4%
                                 | |
| 2014 | 1194 | 
                                    
                                    4.7%
                                 | |
| 2015 | 1171 | 
                                    
                                    4.6%
                                 | |
| 2016 | 1301 | 
                                    
                                    5.1%
                                 | |
| 2017 | 1328 | 
                                    
                                    5.2%
                                 | |
| 2018 | 1350 | 
                                    
                                    5.3%
                                 | |
| 2019 | 1233 | 
                                    
                                    4.8%
                                 | |
| 2020 | 13 | 
                                    
                                    0.1%
                                 | |
| 9999 | NO RESPONSE | 8 | 
                                    
                                    0%
                                 |