| Value | Category | Cases | |
|---|---|---|---|
| 1959 | 1 | 
                                    
                                    0.7%
                                 | |
| 1965 | 1 | 
                                    
                                    0.7%
                                 | |
| 1975 | 1 | 
                                    
                                    0.7%
                                 | |
| 1979 | 2 | 
                                    
                                    1.5%
                                 | |
| 1980 | 2 | 
                                    
                                    1.5%
                                 | |
| 1981 | 2 | 
                                    
                                    1.5%
                                 | |
| 1982 | 1 | 
                                    
                                    0.7%
                                 | |
| 1983 | 2 | 
                                    
                                    1.5%
                                 | |
| 1984 | 2 | 
                                    
                                    1.5%
                                 | |
| 1986 | 1 | 
                                    
                                    0.7%
                                 | |
| 1988 | 4 | 
                                    
                                    2.9%
                                 | |
| 1990 | 3 | 
                                    
                                    2.2%
                                 | |
| 1991 | 2 | 
                                    
                                    1.5%
                                 | |
| 1992 | 4 | 
                                    
                                    2.9%
                                 | |
| 1993 | 1 | 
                                    
                                    0.7%
                                 | |
| 1994 | 2 | 
                                    
                                    1.5%
                                 | |
| 1995 | 7 | 
                                    
                                    5.1%
                                 | |
| 1996 | 3 | 
                                    
                                    2.2%
                                 | |
| 1997 | 3 | 
                                    
                                    2.2%
                                 | |
| 1998 | 4 | 
                                    
                                    2.9%
                                 | |
| 1999 | 2 | 
                                    
                                    1.5%
                                 | |
| 2000 | 7 | 
                                    
                                    5.1%
                                 | |
| 2001 | 3 | 
                                    
                                    2.2%
                                 | |
| 2002 | 3 | 
                                    
                                    2.2%
                                 | |
| 2003 | 1 | 
                                    
                                    0.7%
                                 | |
| 2004 | 4 | 
                                    
                                    2.9%
                                 | |
| 2005 | 7 | 
                                    
                                    5.1%
                                 | |
| 2006 | 6 | 
                                    
                                    4.4%
                                 | |
| 2007 | 8 | 
                                    
                                    5.9%
                                 | |
| 2008 | 4 | 
                                    
                                    2.9%
                                 | |
| 2009 | 3 | 
                                    
                                    2.2%
                                 | |
| 2010 | 5 | 
                                    
                                    3.7%
                                 | |
| 2011 | 12 | 
                                    
                                    8.8%
                                 | |
| 2012 | 3 | 
                                    
                                    2.2%
                                 | |
| 2013 | 9 | 
                                    
                                    6.6%
                                 | |
| 2014 | 10 | 
                                    
                                    7.4%
                                 | |
| 2015 | 1 | 
                                    
                                    0.7%
                                 | |
| Sysmiss | 32003 |