| Value | Category | Cases | |
|---|---|---|---|
| 1987 | 2 |
1.7%
|
|
| 1988 | 1 |
0.8%
|
|
| 1989 | 1 |
0.8%
|
|
| 1990 | 1 |
0.8%
|
|
| 1991 | 4 |
3.3%
|
|
| 1992 | 4 |
3.3%
|
|
| 1993 | 2 |
1.7%
|
|
| 1994 | 4 |
3.3%
|
|
| 1995 | 6 |
5%
|
|
| 1996 | 7 |
5.8%
|
|
| 1997 | 7 |
5.8%
|
|
| 1998 | 9 |
7.4%
|
|
| 1999 | 4 |
3.3%
|
|
| 2000 | 8 |
6.6%
|
|
| 2001 | 6 |
5%
|
|
| 2002 | 7 |
5.8%
|
|
| 2003 | 10 |
8.3%
|
|
| 2004 | 6 |
5%
|
|
| 2005 | 13 |
10.7%
|
|
| 2006 | 9 |
7.4%
|
|
| 2007 | 10 |
8.3%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 10249 |