| Value | Category | Cases | |
|---|---|---|---|
| 1959 | 2 | 
                                    
                                    0.2%
                                 | |
| 1960 | 1 | 
                                    
                                    0.1%
                                 | |
| 1961 | 1 | 
                                    
                                    0.1%
                                 | |
| 1962 | 1 | 
                                    
                                    0.1%
                                 | |
| 1964 | 1 | 
                                    
                                    0.1%
                                 | |
| 1965 | 2 | 
                                    
                                    0.2%
                                 | |
| 1966 | 1 | 
                                    
                                    0.1%
                                 | |
| 1967 | 2 | 
                                    
                                    0.2%
                                 | |
| 1968 | 1 | 
                                    
                                    0.1%
                                 | |
| 1969 | 2 | 
                                    
                                    0.2%
                                 | |
| 1970 | 8 | 
                                    
                                    1%
                                 | |
| 1971 | 2 | 
                                    
                                    0.2%
                                 | |
| 1972 | 4 | 
                                    
                                    0.5%
                                 | |
| 1973 | 5 | 
                                    
                                    0.6%
                                 | |
| 1974 | 4 | 
                                    
                                    0.5%
                                 | |
| 1975 | 4 | 
                                    
                                    0.5%
                                 | |
| 1976 | 1 | 
                                    
                                    0.1%
                                 | |
| 1977 | 2 | 
                                    
                                    0.2%
                                 | |
| 1978 | 3 | 
                                    
                                    0.4%
                                 | |
| 1979 | 8 | 
                                    
                                    1%
                                 | |
| 1980 | 9 | 
                                    
                                    1.1%
                                 | |
| 1981 | 2 | 
                                    
                                    0.2%
                                 | |
| 1982 | 7 | 
                                    
                                    0.9%
                                 | |
| 1983 | 3 | 
                                    
                                    0.4%
                                 | |
| 1984 | 11 | 
                                    
                                    1.3%
                                 | |
| 1985 | 17 | 
                                    
                                    2.1%
                                 | |
| 1986 | 8 | 
                                    
                                    1%
                                 | |
| 1987 | 10 | 
                                    
                                    1.2%
                                 | |
| 1988 | 8 | 
                                    
                                    1%
                                 | |
| 1989 | 16 | 
                                    
                                    2%
                                 | |
| 1990 | 22 | 
                                    
                                    2.7%
                                 | |
| 1991 | 15 | 
                                    
                                    1.8%
                                 | |
| 1992 | 10 | 
                                    
                                    1.2%
                                 | |
| 1993 | 11 | 
                                    
                                    1.3%
                                 | |
| 1994 | 18 | 
                                    
                                    2.2%
                                 | |
| 1995 | 20 | 
                                    
                                    2.4%
                                 | |
| 1996 | 12 | 
                                    
                                    1.5%
                                 | |
| 1997 | 27 | 
                                    
                                    3.3%
                                 | |
| 1998 | 31 | 
                                    
                                    3.8%
                                 | |
| 1999 | 26 | 
                                    
                                    3.2%
                                 | |
| 2000 | 53 | 
                                    
                                    6.5%
                                 | |
| 2001 | 24 | 
                                    
                                    2.9%
                                 | |
| 2002 | 31 | 
                                    
                                    3.8%
                                 | |
| 2003 | 26 | 
                                    
                                    3.2%
                                 | |
| 2004 | 35 | 
                                    
                                    4.3%
                                 | |
| 2005 | 32 | 
                                    
                                    3.9%
                                 | |
| 2006 | 31 | 
                                    
                                    3.8%
                                 | |
| 2007 | 30 | 
                                    
                                    3.7%
                                 | |
| 2008 | 36 | 
                                    
                                    4.4%
                                 | |
| 2009 | 27 | 
                                    
                                    3.3%
                                 | |
| 2010 | 34 | 
                                    
                                    4.2%
                                 | |
| 2011 | 20 | 
                                    
                                    2.4%
                                 | |
| 2012 | 23 | 
                                    
                                    2.8%
                                 | |
| 2013 | 29 | 
                                    
                                    3.5%
                                 | |
| 2014 | 29 | 
                                    
                                    3.5%
                                 | |
| 2015 | 19 | 
                                    
                                    2.3%
                                 | |
| Sysmiss | 31322 |