| Value | Category | Cases | |
|---|---|---|---|
| 1982 | 4 | 
                                    
                                    0%
                                 | |
| 1983 | 9 | 
                                    
                                    0%
                                 | |
| 1984 | 14 | 
                                    
                                    0%
                                 | |
| 1985 | 31 | 
                                    
                                    0.1%
                                 | |
| 1986 | 50 | 
                                    
                                    0.1%
                                 | |
| 1987 | 72 | 
                                    
                                    0.2%
                                 | |
| 1988 | 175 | 
                                    
                                    0.4%
                                 | |
| 1989 | 144 | 
                                    
                                    0.3%
                                 | |
| 1990 | 331 | 
                                    
                                    0.7%
                                 | |
| 1991 | 291 | 
                                    
                                    0.6%
                                 | |
| 1992 | 444 | 
                                    
                                    0.9%
                                 | |
| 1993 | 522 | 
                                    
                                    1.1%
                                 | |
| 1994 | 593 | 
                                    
                                    1.3%
                                 | |
| 1995 | 667 | 
                                    
                                    1.4%
                                 | |
| 1996 | 820 | 
                                    
                                    1.7%
                                 | |
| 1997 | 814 | 
                                    
                                    1.7%
                                 | |
| 1998 | 1227 | 
                                    
                                    2.6%
                                 | |
| 1999 | 1091 | 
                                    
                                    2.3%
                                 | |
| 2000 | 1710 | 
                                    
                                    3.6%
                                 | |
| 2001 | 1323 | 
                                    
                                    2.8%
                                 | |
| 2002 | 1672 | 
                                    
                                    3.6%
                                 | |
| 2003 | 1643 | 
                                    
                                    3.5%
                                 | |
| 2004 | 1854 | 
                                    
                                    4%
                                 | |
| 2005 | 1661 | 
                                    
                                    3.5%
                                 | |
| 2006 | 2048 | 
                                    
                                    4.4%
                                 | |
| 2007 | 1725 | 
                                    
                                    3.7%
                                 | |
| 2008 | 2359 | 
                                    
                                    5%
                                 | |
| 2009 | 1707 | 
                                    
                                    3.6%
                                 | |
| 2010 | 2357 | 
                                    
                                    5%
                                 | |
| 2011 | 2147 | 
                                    
                                    4.6%
                                 | |
| 2012 | 2509 | 
                                    
                                    5.4%
                                 | |
| 2013 | 2529 | 
                                    
                                    5.4%
                                 | |
| 2014 | 2452 | 
                                    
                                    5.2%
                                 | |
| 2015 | 2570 | 
                                    
                                    5.5%
                                 | |
| 2016 | 2477 | 
                                    
                                    5.3%
                                 | |
| 2017 | 2649 | 
                                    
                                    5.7%
                                 | |
| 2018 | 2143 | 
                                    
                                    4.6%
                                 | |
| 9997 | INCOHERENT | 33 | 
                                    
                                    0.1%
                                 |