| Value | Category | Cases | |
|---|---|---|---|
| 1975 | 1 |
1.5%
|
|
| 1977 | 1 |
1.5%
|
|
| 1979 | 2 |
3%
|
|
| 1981 | 1 |
1.5%
|
|
| 1982 | 1 |
1.5%
|
|
| 1983 | 2 |
3%
|
|
| 1985 | 1 |
1.5%
|
|
| 1986 | 2 |
3%
|
|
| 1987 | 2 |
3%
|
|
| 1988 | 4 |
6.1%
|
|
| 1989 | 4 |
6.1%
|
|
| 1990 | 4 |
6.1%
|
|
| 1991 | 4 |
6.1%
|
|
| 1992 | 3 |
4.5%
|
|
| 1993 | 7 |
10.6%
|
|
| 1994 | 3 |
4.5%
|
|
| 1995 | 3 |
4.5%
|
|
| 1996 | 5 |
7.6%
|
|
| 1997 | 2 |
3%
|
|
| 1998 | 1 |
1.5%
|
|
| 1999 | 1 |
1.5%
|
|
| 2001 | 2 |
3%
|
|
| 2002 | 1 |
1.5%
|
|
| 2003 | 2 |
3%
|
|
| 2006 | 2 |
3%
|
|
| 2007 | 1 |
1.5%
|
|
| 2008 | 1 |
1.5%
|
|
| 2009 | 1 |
1.5%
|
|
| 2010 | 2 |
3%
|
|
| 9998 | don't know | 0 |
0%
|
| Sysmiss | 16364 |