| Value | Category | Cases | |
|---|---|---|---|
| 1985 | 1 |
0.2%
|
|
| 1987 | 6 |
0.9%
|
|
| 1988 | 6 |
0.9%
|
|
| 1989 | 7 |
1.1%
|
|
| 1990 | 6 |
0.9%
|
|
| 1991 | 10 |
1.6%
|
|
| 1992 | 9 |
1.4%
|
|
| 1993 | 20 |
3.1%
|
|
| 1994 | 20 |
3.1%
|
|
| 1995 | 28 |
4.4%
|
|
| 1996 | 24 |
3.7%
|
|
| 1997 | 38 |
5.9%
|
|
| 1998 | 34 |
5.3%
|
|
| 1999 | 43 |
6.7%
|
|
| 2000 | 46 |
7.2%
|
|
| 2001 | 49 |
7.6%
|
|
| 2002 | 33 |
5.1%
|
|
| 2003 | 42 |
6.6%
|
|
| 2004 | 49 |
7.6%
|
|
| 2005 | 68 |
10.6%
|
|
| 2006 | 45 |
7%
|
|
| 2007 | 57 |
8.9%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 9729 |