| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 2 | 
                                    
                                    0%
                                 | |
| 1984 | 2 | 
                                    
                                    0%
                                 | |
| 1985 | 7 | 
                                    
                                    0.1%
                                 | |
| 1986 | 19 | 
                                    
                                    0.2%
                                 | |
| 1987 | 41 | 
                                    
                                    0.4%
                                 | |
| 1988 | 63 | 
                                    
                                    0.5%
                                 | |
| 1989 | 120 | 
                                    
                                    1%
                                 | |
| 1990 | 146 | 
                                    
                                    1.3%
                                 | |
| 1991 | 126 | 
                                    
                                    1.1%
                                 | |
| 1992 | 146 | 
                                    
                                    1.3%
                                 | |
| 1993 | 135 | 
                                    
                                    1.2%
                                 | |
| 1994 | 136 | 
                                    
                                    1.2%
                                 | |
| 1995 | 180 | 
                                    
                                    1.6%
                                 | |
| 1996 | 160 | 
                                    
                                    1.4%
                                 | |
| 1997 | 144 | 
                                    
                                    1.3%
                                 | |
| 1998 | 196 | 
                                    
                                    1.7%
                                 | |
| 1999 | 195 | 
                                    
                                    1.7%
                                 | |
| 2000 | 230 | 
                                    
                                    2%
                                 | |
| 2001 | 145 | 
                                    
                                    1.3%
                                 | |
| 2002 | 210 | 
                                    
                                    1.8%
                                 | |
| 2003 | 212 | 
                                    
                                    1.8%
                                 | |
| 2004 | 200 | 
                                    
                                    1.7%
                                 | |
| 2005 | 188 | 
                                    
                                    1.6%
                                 | |
| 2006 | 209 | 
                                    
                                    1.8%
                                 | |
| 2007 | 244 | 
                                    
                                    2.1%
                                 | |
| 2008 | 256 | 
                                    
                                    2.2%
                                 | |
| 2009 | 310 | 
                                    
                                    2.7%
                                 | |
| 2010 | 292 | 
                                    
                                    2.5%
                                 | |
| 2011 | 269 | 
                                    
                                    2.3%
                                 | |
| 2012 | 281 | 
                                    
                                    2.5%
                                 | |
| 2013 | 315 | 
                                    
                                    2.7%
                                 | |
| 2014 | 317 | 
                                    
                                    2.8%
                                 | |
| 2015 | 341 | 
                                    
                                    3%
                                 | |
| 2016 | 364 | 
                                    
                                    3.2%
                                 | |
| 2017 | 379 | 
                                    
                                    3.3%
                                 | |
| 2018 | 317 | 
                                    
                                    2.8%
                                 | |
| 2019 | 237 | 
                                    
                                    2.1%
                                 | |
| 2020 | 1 | 
                                    
                                    0%
                                 | |
| 9997 | INCONSISTENT | 2 | 
                                    
                                    0%
                                 | 
| 9998 | DK | 43 | 
                                    
                                    0.4%
                                 | 
| Sysmiss | 4284 | 
                                    
                                    37.4%
                                 |