| Value | Category | Cases | |
|---|---|---|---|
| 1975 | 4 |
0.5%
|
|
| 1976 | 1 |
0.1%
|
|
| 1978 | 2 |
0.2%
|
|
| 1979 | 2 |
0.2%
|
|
| 1980 | 4 |
0.5%
|
|
| 1981 | 3 |
0.4%
|
|
| 1982 | 1 |
0.1%
|
|
| 1983 | 6 |
0.7%
|
|
| 1984 | 10 |
1.2%
|
|
| 1985 | 6 |
0.7%
|
|
| 1986 | 7 |
0.9%
|
|
| 1987 | 12 |
1.5%
|
|
| 1988 | 9 |
1.1%
|
|
| 1989 | 14 |
1.7%
|
|
| 1990 | 15 |
1.9%
|
|
| 1991 | 16 |
2%
|
|
| 1992 | 15 |
1.9%
|
|
| 1993 | 15 |
1.9%
|
|
| 1994 | 21 |
2.6%
|
|
| 1995 | 17 |
2.1%
|
|
| 1996 | 18 |
2.2%
|
|
| 1997 | 25 |
3.1%
|
|
| 1998 | 36 |
4.5%
|
|
| 1999 | 25 |
3.1%
|
|
| 2000 | 41 |
5.1%
|
|
| 2001 | 27 |
3.4%
|
|
| 2002 | 43 |
5.4%
|
|
| 2003 | 39 |
4.9%
|
|
| 2004 | 36 |
4.5%
|
|
| 2005 | 55 |
6.9%
|
|
| 2006 | 54 |
6.7%
|
|
| 2007 | 83 |
10.3%
|
|
| 2008 | 131 |
16.3%
|
|
| 2009 | 8 |
1%
|
|
| 9997 | Inconsistent | 0 |
0%
|
| 9998 | DK | 1 |
0.1%
|
| Sysmiss | 7642 |