| Value | Category | Cases | |
|---|---|---|---|
| 1976 | 1 |
0%
|
|
| 1977 | 6 |
0.1%
|
|
| 1978 | 12 |
0.1%
|
|
| 1979 | 15 |
0.2%
|
|
| 1980 | 28 |
0.3%
|
|
| 1981 | 31 |
0.3%
|
|
| 1982 | 43 |
0.4%
|
|
| 1983 | 49 |
0.5%
|
|
| 1984 | 68 |
0.7%
|
|
| 1985 | 73 |
0.7%
|
|
| 1986 | 102 |
1%
|
|
| 1987 | 129 |
1.3%
|
|
| 1988 | 133 |
1.3%
|
|
| 1989 | 104 |
1%
|
|
| 1990 | 168 |
1.7%
|
|
| 1991 | 135 |
1.4%
|
|
| 1992 | 248 |
2.5%
|
|
| 1993 | 177 |
1.8%
|
|
| 1994 | 269 |
2.7%
|
|
| 1995 | 237 |
2.4%
|
|
| 1996 | 280 |
2.8%
|
|
| 1997 | 303 |
3%
|
|
| 1998 | 326 |
3.3%
|
|
| 1999 | 348 |
3.5%
|
|
| 2000 | 409 |
4.1%
|
|
| 2001 | 329 |
3.3%
|
|
| 2002 | 455 |
4.6%
|
|
| 2003 | 383 |
3.8%
|
|
| 2004 | 496 |
5%
|
|
| 2005 | 502 |
5%
|
|
| 2006 | 603 |
6.1%
|
|
| 2007 | 519 |
5.2%
|
|
| 2008 | 634 |
6.4%
|
|
| 2009 | 604 |
6.1%
|
|
| 2010 | 598 |
6%
|
|
| 2011 | 574 |
5.8%
|
|
| 2012 | 375 |
3.8%
|
|
| 9997 | Inconsistent | 13 |
0.1%
|
| 9998 | DK | 172 |
1.7%
|
| 9999 | Missing | 5 |
0.1%
|