| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 3 |
0%
|
|
| 1981 | 5 |
0%
|
|
| 1982 | 7 |
0%
|
|
| 1983 | 9 |
0%
|
|
| 1984 | 22 |
0%
|
|
| 1985 | 25 |
0%
|
|
| 1986 | 34 |
0%
|
|
| 1987 | 46 |
0.1%
|
|
| 1988 | 101 |
0.1%
|
|
| 1989 | 173 |
0.2%
|
|
| 1990 | 272 |
0.3%
|
|
| 1991 | 227 |
0.3%
|
|
| 1992 | 324 |
0.4%
|
|
| 1993 | 373 |
0.5%
|
|
| 1994 | 564 |
0.7%
|
|
| 1995 | 513 |
0.6%
|
|
| 1996 | 618 |
0.7%
|
|
| 1997 | 738 |
0.9%
|
|
| 1998 | 836 |
1%
|
|
| 1999 | 1448 |
1.8%
|
|
| 2000 | 1577 |
1.9%
|
|
| 2001 | 1756 |
2.1%
|
|
| 2002 | 1763 |
2.1%
|
|
| 2003 | 2085 |
2.5%
|
|
| 2004 | 2500 |
3%
|
|
| 2005 | 2777 |
3.4%
|
|
| 2006 | 2755 |
3.3%
|
|
| 2007 | 3283 |
4%
|
|
| 2008 | 3024 |
3.7%
|
|
| 2009 | 4395 |
5.3%
|
|
| 2010 | 4107 |
5%
|
|
| 2011 | 4709 |
5.7%
|
|
| 2012 | 5198 |
6.3%
|
|
| 2013 | 5425 |
6.6%
|
|
| 2014 | 5751 |
7%
|
|
| 2015 | 6144 |
7.4%
|
|
| 2016 | 5799 |
7%
|
|
| 2017 | 5279 |
6.4%
|
|
| 2018 | 4325 |
5.2%
|
|
| 2019 | 2864 |
3.5%
|
|
| 2020 | 211 |
0.3%
|
|
| 9997 | Inconsistent | 392 |
0.5%
|
| 9999 | NO RESPONSE | 19 |
0%
|