| Value | Category | Cases | |
|---|---|---|---|
| 1980 | 1 |
0.4%
|
|
| 1982 | 1 |
0.4%
|
|
| 1983 | 1 |
0.4%
|
|
| 1984 | 2 |
0.9%
|
|
| 1985 | 4 |
1.7%
|
|
| 1986 | 1 |
0.4%
|
|
| 1987 | 7 |
3%
|
|
| 1988 | 11 |
4.7%
|
|
| 1989 | 7 |
3%
|
|
| 1990 | 8 |
3.4%
|
|
| 1991 | 8 |
3.4%
|
|
| 1992 | 6 |
2.6%
|
|
| 1993 | 11 |
4.7%
|
|
| 1994 | 5 |
2.2%
|
|
| 1995 | 10 |
4.3%
|
|
| 1996 | 11 |
4.7%
|
|
| 1997 | 8 |
3.4%
|
|
| 1998 | 9 |
3.9%
|
|
| 1999 | 15 |
6.5%
|
|
| 2000 | 14 |
6%
|
|
| 2001 | 13 |
5.6%
|
|
| 2002 | 16 |
6.9%
|
|
| 2003 | 12 |
5.2%
|
|
| 2004 | 14 |
6%
|
|
| 2005 | 10 |
4.3%
|
|
| 2006 | 12 |
5.2%
|
|
| 2007 | 15 |
6.5%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 0 |
0%
|
| Sysmiss | 10138 |