| Value | Category | Cases | |
|---|---|---|---|
| 1978 | 10 |
0.1%
|
|
| 1979 | 11 |
0.1%
|
|
| 1980 | 24 |
0.2%
|
|
| 1981 | 14 |
0.1%
|
|
| 1982 | 92 |
0.7%
|
|
| 1983 | 31 |
0.2%
|
|
| 1984 | 75 |
0.6%
|
|
| 1985 | 101 |
0.8%
|
|
| 1986 | 84 |
0.7%
|
|
| 1987 | 65 |
0.5%
|
|
| 1988 | 102 |
0.8%
|
|
| 1989 | 138 |
1.1%
|
|
| 1990 | 179 |
1.4%
|
|
| 1991 | 197 |
1.5%
|
|
| 1992 | 272 |
2.1%
|
|
| 1993 | 249 |
1.9%
|
|
| 1994 | 289 |
2.2%
|
|
| 1995 | 379 |
3%
|
|
| 1996 | 344 |
2.7%
|
|
| 1997 | 373 |
2.9%
|
|
| 1998 | 375 |
2.9%
|
|
| 1999 | 423 |
3.3%
|
|
| 2000 | 574 |
4.5%
|
|
| 2001 | 444 |
3.5%
|
|
| 2002 | 564 |
4.4%
|
|
| 2003 | 717 |
5.6%
|
|
| 2004 | 797 |
6.2%
|
|
| 2005 | 650 |
5.1%
|
|
| 2006 | 745 |
5.8%
|
|
| 2007 | 865 |
6.7%
|
|
| 2008 | 1180 |
9.2%
|
|
| 2009 | 1298 |
10.1%
|
|
| 2010 | 1180 |
9.2%
|
|
| 2011 | 3 |
0%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 1 |
0%
|
| 10001 | .Z | 24666 |