| Value | Category | Cases | |
|---|---|---|---|
| 1985 | 1 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 1986 | 4 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    |
| 1988 | 10 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 1989 | 11 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 1990 | 16 | 
                                                                 
                                    
                                    0.1%
                                 
                                                             | 
                                                        
                    |
| 1991 | 30 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 1992 | 46 | 
                                                                 
                                    
                                    0.3%
                                 
                                                             | 
                                                        
                    |
| 1993 | 62 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 1994 | 50 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 1995 | 65 | 
                                                                 
                                    
                                    0.5%
                                 
                                                             | 
                                                        
                    |
| 1996 | 95 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 1997 | 94 | 
                                                                 
                                    
                                    0.7%
                                 
                                                             | 
                                                        
                    |
| 1998 | 159 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 1999 | 169 | 
                                                                 
                                    
                                    1.2%
                                 
                                                             | 
                                                        
                    |
| 2000 | 155 | 
                                                                 
                                    
                                    1.1%
                                 
                                                             | 
                                                        
                    |
| 2001 | 202 | 
                                                                 
                                    
                                    1.5%
                                 
                                                             | 
                                                        
                    |
| 2002 | 246 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    |
| 2003 | 196 | 
                                                                 
                                    
                                    1.4%
                                 
                                                             | 
                                                        
                    |
| 2004 | 263 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    |
| 2005 | 245 | 
                                                                 
                                    
                                    1.8%
                                 
                                                             | 
                                                        
                    |
| 2006 | 287 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| 2007 | 351 | 
                                                                 
                                    
                                    2.5%
                                 
                                                             | 
                                                        
                    |
| 2008 | 405 | 
                                                                 
                                    
                                    2.9%
                                 
                                                             | 
                                                        
                    |
| 2009 | 352 | 
                                                                 
                                    
                                    2.5%
                                 
                                                             | 
                                                        
                    |
| 2010 | 422 | 
                                                                 
                                    
                                    3%
                                 
                                                             | 
                                                        
                    |
| 2011 | 547 | 
                                                                 
                                    
                                    3.9%
                                 
                                                             | 
                                                        
                    |
| 2012 | 798 | 
                                                                 
                                    
                                    5.7%
                                 
                                                             | 
                                                        
                    |
| 2013 | 1048 | 
                                                                 
                                    
                                    7.5%
                                 
                                                             | 
                                                        
                    |
| 2014 | 1315 | 
                                                                 
                                    
                                    9.5%
                                 
                                                             | 
                                                        
                    |
| 2015 | 1653 | 
                                                                 
                                    
                                    11.9%
                                 
                                                             | 
                                                        
                    |
| 2016 | 1788 | 
                                                                 
                                    
                                    12.9%
                                 
                                                             | 
                                                        
                    |
| 2017 | 1948 | 
                                                                 
                                    
                                    14%
                                 
                                                             | 
                                                        
                    |
| 2018 | 825 | 
                                                                 
                                    
                                    5.9%
                                 
                                                             | 
                                                        
                    |
| 9999 | No response | 32 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             |