| Value | Category | Cases | |
|---|---|---|---|
| 1989 | 2 |
1.2%
|
|
| 1990 | 2 |
1.2%
|
|
| 1991 | 2 |
1.2%
|
|
| 1992 | 1 |
0.6%
|
|
| 1993 | 1 |
0.6%
|
|
| 1994 | 6 |
3.5%
|
|
| 1995 | 3 |
1.8%
|
|
| 1996 | 8 |
4.7%
|
|
| 1997 | 9 |
5.3%
|
|
| 1998 | 8 |
4.7%
|
|
| 1999 | 9 |
5.3%
|
|
| 2000 | 12 |
7.1%
|
|
| 2001 | 22 |
12.9%
|
|
| 2002 | 19 |
11.2%
|
|
| 2003 | 19 |
11.2%
|
|
| 2004 | 12 |
7.1%
|
|
| 2005 | 13 |
7.6%
|
|
| 2006 | 7 |
4.1%
|
|
| 2007 | 15 |
8.8%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 10200 |