| Value | Category | Cases | |
|---|---|---|---|
| 99 | Don't Know | 0 | 
                                                                 
                                    
                                    0%
                                 
                                                             | 
                                                        
                    
| 1952 | 1 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 1972 | 1 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 1977 | 1 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 1980 | 6 | 
                                                                 
                                    
                                    1.2%
                                 
                                                             | 
                                                        
                    |
| 1982 | 2 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 1984 | 2 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 1985 | 1 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 1987 | 4 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 1988 | 2 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 1989 | 5 | 
                                                                 
                                    
                                    1%
                                 
                                                             | 
                                                        
                    |
| 1992 | 2 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 1993 | 4 | 
                                                                 
                                    
                                    0.8%
                                 
                                                             | 
                                                        
                    |
| 1994 | 1 | 
                                                                 
                                    
                                    0.2%
                                 
                                                             | 
                                                        
                    |
| 1995 | 3 | 
                                                                 
                                    
                                    0.6%
                                 
                                                             | 
                                                        
                    |
| 1996 | 2 | 
                                                                 
                                    
                                    0.4%
                                 
                                                             | 
                                                        
                    |
| 1997 | 8 | 
                                                                 
                                    
                                    1.6%
                                 
                                                             | 
                                                        
                    |
| 1998 | 15 | 
                                                                 
                                    
                                    2.9%
                                 
                                                             | 
                                                        
                    |
| 1999 | 10 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    |
| 2000 | 19 | 
                                                                 
                                    
                                    3.7%
                                 
                                                             | 
                                                        
                    |
| 2001 | 13 | 
                                                                 
                                    
                                    2.5%
                                 
                                                             | 
                                                        
                    |
| 2002 | 16 | 
                                                                 
                                    
                                    3.1%
                                 
                                                             | 
                                                        
                    |
| 2003 | 13 | 
                                                                 
                                    
                                    2.5%
                                 
                                                             | 
                                                        
                    |
| 2004 | 16 | 
                                                                 
                                    
                                    3.1%
                                 
                                                             | 
                                                        
                    |
| 2005 | 16 | 
                                                                 
                                    
                                    3.1%
                                 
                                                             | 
                                                        
                    |
| 2006 | 12 | 
                                                                 
                                    
                                    2.3%
                                 
                                                             | 
                                                        
                    |
| 2007 | 11 | 
                                                                 
                                    
                                    2.1%
                                 
                                                             | 
                                                        
                    |
| 2008 | 13 | 
                                                                 
                                    
                                    2.5%
                                 
                                                             | 
                                                        
                    |
| 2009 | 10 | 
                                                                 
                                    
                                    1.9%
                                 
                                                             | 
                                                        
                    |
| 2010 | 22 | 
                                                                 
                                    
                                    4.3%
                                 
                                                             | 
                                                        
                    |
| 2011 | 9 | 
                                                                 
                                    
                                    1.7%
                                 
                                                             | 
                                                        
                    |
| 2012 | 22 | 
                                                                 
                                    
                                    4.3%
                                 
                                                             | 
                                                        
                    |
| 2013 | 30 | 
                                                                 
                                    
                                    5.8%
                                 
                                                             | 
                                                        
                    |
| 2014 | 28 | 
                                                                 
                                    
                                    5.4%
                                 
                                                             | 
                                                        
                    |
| 2015 | 38 | 
                                                                 
                                    
                                    7.4%
                                 
                                                             | 
                                                        
                    |
| 2016 | 39 | 
                                                                 
                                    
                                    7.6%
                                 
                                                             | 
                                                        
                    |
| 2017 | 39 | 
                                                                 
                                    
                                    7.6%
                                 
                                                             | 
                                                        
                    |
| 2018 | 35 | 
                                                                 
                                    
                                    6.8%
                                 
                                                             | 
                                                        
                    |
| 2019 | 45 | 
                                                                 
                                    
                                    8.7%
                                 
                                                             | 
                                                        
                    |
| Sysmiss | 5835 |