| Value | Category | Cases | |
|---|---|---|---|
| 1984 | 2 |
0.3%
|
|
| 1985 | 6 |
0.8%
|
|
| 1986 | 3 |
0.4%
|
|
| 1987 | 3 |
0.4%
|
|
| 1988 | 2 |
0.3%
|
|
| 1989 | 5 |
0.7%
|
|
| 1990 | 9 |
1.2%
|
|
| 1991 | 4 |
0.5%
|
|
| 1992 | 12 |
1.6%
|
|
| 1993 | 6 |
0.8%
|
|
| 1994 | 15 |
2%
|
|
| 1995 | 14 |
1.8%
|
|
| 1996 | 17 |
2.2%
|
|
| 1997 | 27 |
3.5%
|
|
| 1998 | 46 |
6%
|
|
| 1999 | 56 |
7.4%
|
|
| 2000 | 50 |
6.6%
|
|
| 2001 | 73 |
9.6%
|
|
| 2002 | 74 |
9.7%
|
|
| 2003 | 124 |
16.3%
|
|
| 2004 | 213 |
28%
|
|
| 9997 | inconsistent | 0 |
0%
|
| 9998 | don't know | 0 |
0%
|
| 10001 | .Z | 7471 |