| Value | Category | Cases | |
|---|---|---|---|
| 1979 | 1 |
0%
|
|
| 1982 | 1 |
0%
|
|
| 1983 | 2 |
0%
|
|
| 1985 | 2 |
0%
|
|
| 1986 | 8 |
0.1%
|
|
| 1987 | 18 |
0.2%
|
|
| 1988 | 57 |
0.5%
|
|
| 1989 | 117 |
1%
|
|
| 1990 | 196 |
1.7%
|
|
| 1991 | 199 |
1.7%
|
|
| 1992 | 194 |
1.7%
|
|
| 1993 | 240 |
2%
|
|
| 1994 | 214 |
1.8%
|
|
| 1995 | 231 |
2%
|
|
| 1996 | 234 |
2%
|
|
| 1997 | 263 |
2.2%
|
|
| 1998 | 261 |
2.2%
|
|
| 1999 | 290 |
2.5%
|
|
| 2000 | 376 |
3.2%
|
|
| 2001 | 218 |
1.9%
|
|
| 2002 | 255 |
2.2%
|
|
| 2003 | 275 |
2.3%
|
|
| 2004 | 280 |
2.4%
|
|
| 2005 | 317 |
2.7%
|
|
| 2006 | 368 |
3.1%
|
|
| 2007 | 378 |
3.2%
|
|
| 2008 | 434 |
3.7%
|
|
| 2009 | 366 |
3.1%
|
|
| 2010 | 405 |
3.5%
|
|
| 2011 | 362 |
3.1%
|
|
| 2012 | 392 |
3.3%
|
|
| 2013 | 365 |
3.1%
|
|
| 2014 | 376 |
3.2%
|
|
| 2015 | 310 |
2.6%
|
|
| 2016 | 250 |
2.1%
|
|
| 2017 | 277 |
2.4%
|
|
| 2018 | 123 |
1%
|
|
| 9997 | inconsistent | 1 |
0%
|
| 9998 | dk | 97 |
0.8%
|
| 9999 | NO RESPONSE | 4 |
0%
|
| Sysmiss | 2980 |
25.4%
|