| Value | Category | Cases | |
|---|---|---|---|
| 1974 | 2 |
0%
|
|
| 1975 | 2 |
0%
|
|
| 1976 | 7 |
0.1%
|
|
| 1977 | 13 |
0.2%
|
|
| 1978 | 20 |
0.3%
|
|
| 1979 | 35 |
0.5%
|
|
| 1980 | 95 |
1.2%
|
|
| 1981 | 86 |
1.1%
|
|
| 1982 | 113 |
1.5%
|
|
| 1983 | 131 |
1.7%
|
|
| 1984 | 135 |
1.7%
|
|
| 1985 | 165 |
2.1%
|
|
| 1986 | 153 |
2%
|
|
| 1987 | 168 |
2.2%
|
|
| 1988 | 188 |
2.4%
|
|
| 1989 | 212 |
2.7%
|
|
| 1990 | 278 |
3.6%
|
|
| 1991 | 222 |
2.9%
|
|
| 1992 | 236 |
3.1%
|
|
| 1993 | 208 |
2.7%
|
|
| 1994 | 215 |
2.8%
|
|
| 1995 | 220 |
2.8%
|
|
| 1996 | 255 |
3.3%
|
|
| 1997 | 251 |
3.2%
|
|
| 1998 | 291 |
3.8%
|
|
| 1999 | 251 |
3.2%
|
|
| 2000 | 347 |
4.5%
|
|
| 2001 | 230 |
3%
|
|
| 2002 | 242 |
3.1%
|
|
| 2003 | 255 |
3.3%
|
|
| 2004 | 261 |
3.4%
|
|
| 2005 | 227 |
2.9%
|
|
| 2006 | 253 |
3.3%
|
|
| 2007 | 239 |
3.1%
|
|
| 2008 | 280 |
3.6%
|
|
| 2009 | 217 |
2.8%
|
|
| 2010 | 193 |
2.5%
|
|
| 2011 | 101 |
1.3%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 931 |
12%
|
| 9999 | Missing | 0 |
0%
|
| Sysmiss | 3235 |