| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 70 |
0.1%
|
|
| 1981 | 21 |
0%
|
|
| 1982 | 36 |
0.1%
|
|
| 1983 | 102 |
0.2%
|
|
| 1984 | 114 |
0.2%
|
|
| 1985 | 211 |
0.3%
|
|
| 1986 | 273 |
0.4%
|
|
| 1987 | 365 |
0.6%
|
|
| 1988 | 791 |
1.2%
|
|
| 1989 | 697 |
1.1%
|
|
| 1990 | 1145 |
1.7%
|
|
| 1991 | 1008 |
1.5%
|
|
| 1992 | 1331 |
2%
|
|
| 1993 | 1439 |
2.2%
|
|
| 1994 | 1540 |
2.3%
|
|
| 1995 | 1611 |
2.4%
|
|
| 1996 | 2075 |
3.1%
|
|
| 1997 | 1999 |
3%
|
|
| 1998 | 2823 |
4.3%
|
|
| 1999 | 2221 |
3.4%
|
|
| 2000 | 3730 |
5.6%
|
|
| 2001 | 2525 |
3.8%
|
|
| 2002 | 2619 |
4%
|
|
| 2003 | 2644 |
4%
|
|
| 2004 | 2839 |
4.3%
|
|
| 2005 | 2687 |
4.1%
|
|
| 2006 | 3209 |
4.9%
|
|
| 2007 | 2242 |
3.4%
|
|
| 2008 | 3114 |
4.7%
|
|
| 2009 | 2682 |
4.1%
|
|
| 2010 | 3102 |
4.7%
|
|
| 2011 | 2941 |
4.5%
|
|
| 2012 | 2465 |
3.7%
|
|
| 2013 | 2155 |
3.3%
|
|
| 2014 | 2138 |
3.2%
|
|
| 2015 | 1817 |
2.7%
|
|
| 2016 | 1306 |
2%
|
|
| 2017 | 840 |
1.3%
|
|
| 2018 | 799 |
1.2%
|
|
| 2019 | 47 |
0.1%
|
|
| 9997 | Inconsistent | 302 |
0.5%
|
| 9999 | NO RESPONSE | 5 |
0%
|