| Value | Category | Cases | |
|---|---|---|---|
| 1977 | 1 |
1.4%
|
|
| 1980 | 1 |
1.4%
|
|
| 1982 | 1 |
1.4%
|
|
| 1983 | 1 |
1.4%
|
|
| 1987 | 1 |
1.4%
|
|
| 1989 | 2 |
2.8%
|
|
| 1991 | 1 |
1.4%
|
|
| 1992 | 2 |
2.8%
|
|
| 1993 | 2 |
2.8%
|
|
| 1994 | 3 |
4.2%
|
|
| 1996 | 1 |
1.4%
|
|
| 1997 | 2 |
2.8%
|
|
| 1998 | 4 |
5.6%
|
|
| 1999 | 5 |
6.9%
|
|
| 2000 | 10 |
13.9%
|
|
| 2001 | 13 |
18.1%
|
|
| 2002 | 18 |
25%
|
|
| 2003 | 4 |
5.6%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | Dk | 0 |
0%
|
| 9999 | 3 | ||
| Sysmiss | 7910 |