| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 4 |
0%
|
|
| 1981 | 7 |
0%
|
|
| 1982 | 12 |
0.1%
|
|
| 1983 | 12 |
0.1%
|
|
| 1984 | 12 |
0.1%
|
|
| 1985 | 29 |
0.2%
|
|
| 1986 | 48 |
0.3%
|
|
| 1987 | 55 |
0.4%
|
|
| 1988 | 73 |
0.5%
|
|
| 1989 | 71 |
0.5%
|
|
| 1990 | 100 |
0.7%
|
|
| 1991 | 98 |
0.7%
|
|
| 1992 | 118 |
0.8%
|
|
| 1993 | 135 |
0.9%
|
|
| 1994 | 150 |
1%
|
|
| 1995 | 132 |
0.9%
|
|
| 1996 | 141 |
1%
|
|
| 1997 | 161 |
1.1%
|
|
| 1998 | 213 |
1.5%
|
|
| 1999 | 156 |
1.1%
|
|
| 2000 | 256 |
1.8%
|
|
| 2001 | 176 |
1.2%
|
|
| 2002 | 214 |
1.5%
|
|
| 2003 | 202 |
1.4%
|
|
| 2004 | 188 |
1.3%
|
|
| 2005 | 245 |
1.7%
|
|
| 2006 | 262 |
1.8%
|
|
| 2007 | 318 |
2.2%
|
|
| 2008 | 308 |
2.2%
|
|
| 2009 | 276 |
1.9%
|
|
| 2010 | 348 |
2.4%
|
|
| 2011 | 311 |
2.2%
|
|
| 2012 | 335 |
2.3%
|
|
| 2013 | 322 |
2.3%
|
|
| 2014 | 325 |
2.3%
|
|
| 2015 | 387 |
2.7%
|
|
| 2016 | 343 |
2.4%
|
|
| 2017 | 418 |
2.9%
|
|
| 2018 | 80 |
0.6%
|
|
| 9997 | INCONSISTENT | 379 |
2.7%
|
| 9998 | DK | 2338 |
16.4%
|
| 9999 | NO RESPONSE | 2 |
0%
|
| Sysmiss | 4537 |
31.7%
|