| Value | Category | Cases | |
|---|---|---|---|
| 1950 | 1 | 
                                    
                                    0.3%
                                 | |
| 1960 | 1 | 
                                    
                                    0.3%
                                 | |
| 1962 | 1 | 
                                    
                                    0.3%
                                 | |
| 1976 | 1 | 
                                    
                                    0.3%
                                 | |
| 1979 | 2 | 
                                    
                                    0.6%
                                 | |
| 1981 | 1 | 
                                    
                                    0.3%
                                 | |
| 1982 | 1 | 
                                    
                                    0.3%
                                 | |
| 1984 | 2 | 
                                    
                                    0.6%
                                 | |
| 1985 | 4 | 
                                    
                                    1.2%
                                 | |
| 1986 | 3 | 
                                    
                                    0.9%
                                 | |
| 1987 | 5 | 
                                    
                                    1.5%
                                 | |
| 1988 | 1 | 
                                    
                                    0.3%
                                 | |
| 1989 | 3 | 
                                    
                                    0.9%
                                 | |
| 1990 | 5 | 
                                    
                                    1.5%
                                 | |
| 1991 | 1 | 
                                    
                                    0.3%
                                 | |
| 1992 | 5 | 
                                    
                                    1.5%
                                 | |
| 1993 | 4 | 
                                    
                                    1.2%
                                 | |
| 1994 | 1 | 
                                    
                                    0.3%
                                 | |
| 1995 | 3 | 
                                    
                                    0.9%
                                 | |
| 1996 | 4 | 
                                    
                                    1.2%
                                 | |
| 1997 | 5 | 
                                    
                                    1.5%
                                 | |
| 1998 | 5 | 
                                    
                                    1.5%
                                 | |
| 1999 | 6 | 
                                    
                                    1.8%
                                 | |
| 2000 | 10 | 
                                    
                                    3%
                                 | |
| 2001 | 4 | 
                                    
                                    1.2%
                                 | |
| 2002 | 4 | 
                                    
                                    1.2%
                                 | |
| 2003 | 3 | 
                                    
                                    0.9%
                                 | |
| 2004 | 8 | 
                                    
                                    2.4%
                                 | |
| 2005 | 10 | 
                                    
                                    3%
                                 | |
| 2006 | 4 | 
                                    
                                    1.2%
                                 | |
| 2007 | 5 | 
                                    
                                    1.5%
                                 | |
| 2008 | 14 | 
                                    
                                    4.3%
                                 | |
| 2009 | 12 | 
                                    
                                    3.7%
                                 | |
| 2010 | 11 | 
                                    
                                    3.4%
                                 | |
| 2011 | 12 | 
                                    
                                    3.7%
                                 | |
| 2012 | 12 | 
                                    
                                    3.7%
                                 | |
| 2013 | 6 | 
                                    
                                    1.8%
                                 | |
| 2014 | 21 | 
                                    
                                    6.4%
                                 | |
| 2015 | 30 | 
                                    
                                    9.1%
                                 | |
| 2016 | 29 | 
                                    
                                    8.8%
                                 | |
| 2017 | 24 | 
                                    
                                    7.3%
                                 | |
| 3333 | Missing | 0 | 
                                    
                                    0%
                                 | 
| 5555 | Not applicable | 0 | 
                                    
                                    0%
                                 | 
| 8888 | Refused | 0 | 
                                    
                                    0%
                                 | 
| 9999 | Don't know | 44 | 
                                    
                                    13.4%
                                 | 
| Sysmiss | 671 |