| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 1 |
0%
|
|
| 1983 | 4 |
0%
|
|
| 1984 | 3 |
0%
|
|
| 1985 | 8 |
0.1%
|
|
| 1986 | 14 |
0.2%
|
|
| 1987 | 16 |
0.2%
|
|
| 1988 | 19 |
0.2%
|
|
| 1989 | 24 |
0.3%
|
|
| 1990 | 61 |
0.7%
|
|
| 1991 | 26 |
0.3%
|
|
| 1992 | 50 |
0.6%
|
|
| 1993 | 61 |
0.7%
|
|
| 1994 | 78 |
0.9%
|
|
| 1995 | 107 |
1.2%
|
|
| 1996 | 114 |
1.3%
|
|
| 1997 | 119 |
1.3%
|
|
| 1998 | 195 |
2.2%
|
|
| 1999 | 149 |
1.7%
|
|
| 2000 | 213 |
2.4%
|
|
| 2001 | 124 |
1.4%
|
|
| 2002 | 157 |
1.7%
|
|
| 2003 | 142 |
1.6%
|
|
| 2004 | 141 |
1.6%
|
|
| 2005 | 142 |
1.6%
|
|
| 2006 | 146 |
1.6%
|
|
| 2007 | 140 |
1.6%
|
|
| 2008 | 217 |
2.4%
|
|
| 2009 | 149 |
1.7%
|
|
| 2010 | 209 |
2.3%
|
|
| 2011 | 185 |
2.1%
|
|
| 2012 | 219 |
2.4%
|
|
| 2013 | 233 |
2.6%
|
|
| 2014 | 240 |
2.7%
|
|
| 2015 | 246 |
2.7%
|
|
| 2016 | 244 |
2.7%
|
|
| 2017 | 254 |
2.8%
|
|
| 2018 | 141 |
1.6%
|
|
| 9997 | INCOHERENT | 6 |
0.1%
|
| 9998 | NSP | 202 |
2.2%
|
| Sysmiss | 4181 |
46.6%
|