| Value | Category | Cases | |
|---|---|---|---|
| 1984 | 2 |
0.1%
|
|
| 1985 | 6 |
0.3%
|
|
| 1986 | 3 |
0.1%
|
|
| 1987 | 3 |
0.1%
|
|
| 1988 | 2 |
0.1%
|
|
| 1989 | 5 |
0.2%
|
|
| 1990 | 9 |
0.4%
|
|
| 1991 | 4 |
0.2%
|
|
| 1992 | 12 |
0.6%
|
|
| 1993 | 5 |
0.2%
|
|
| 1994 | 15 |
0.7%
|
|
| 1995 | 13 |
0.6%
|
|
| 1996 | 16 |
0.7%
|
|
| 1997 | 24 |
1.1%
|
|
| 1998 | 38 |
1.8%
|
|
| 1999 | 52 |
2.4%
|
|
| 2000 | 39 |
1.8%
|
|
| 2001 | 62 |
2.9%
|
|
| 2002 | 66 |
3.1%
|
|
| 2003 | 95 |
4.4%
|
|
| 2004 | 156 |
7.2%
|
|
| 2005 | 145 |
6.7%
|
|
| 2006 | 186 |
8.6%
|
|
| 2007 | 217 |
10%
|
|
| 2008 | 334 |
15.4%
|
|
| 2009 | 328 |
15.2%
|
|
| 2010 | 326 |
15.1%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | dk | 0 |
0%
|
| 10001 | .Z | 6069 |