| Value | Category | Cases | |
|---|---|---|---|
| 1970 | 5 |
0%
|
|
| 1971 | 12 |
0.1%
|
|
| 1972 | 10 |
0%
|
|
| 1973 | 25 |
0.1%
|
|
| 1974 | 78 |
0.3%
|
|
| 1975 | 107 |
0.5%
|
|
| 1976 | 244 |
1%
|
|
| 1977 | 273 |
1.2%
|
|
| 1978 | 474 |
2%
|
|
| 1979 | 680 |
2.9%
|
|
| 1980 | 762 |
3.2%
|
|
| 1981 | 529 |
2.2%
|
|
| 1982 | 562 |
2.4%
|
|
| 1983 | 603 |
2.5%
|
|
| 1984 | 675 |
2.8%
|
|
| 1985 | 632 |
2.7%
|
|
| 1986 | 696 |
2.9%
|
|
| 1987 | 783 |
3.3%
|
|
| 1988 | 622 |
2.6%
|
|
| 1989 | 775 |
3.3%
|
|
| 1990 | 816 |
3.4%
|
|
| 1991 | 869 |
3.7%
|
|
| 1992 | 797 |
3.4%
|
|
| 1993 | 827 |
3.5%
|
|
| 1994 | 880 |
3.7%
|
|
| 1995 | 854 |
3.6%
|
|
| 1996 | 840 |
3.5%
|
|
| 1997 | 937 |
4%
|
|
| 1998 | 792 |
3.3%
|
|
| 1999 | 940 |
4%
|
|
| 2000 | 928 |
3.9%
|
|
| 2001 | 806 |
3.4%
|
|
| 2002 | 645 |
2.7%
|
|
| 2003 | 749 |
3.2%
|
|
| 2004 | 651 |
2.7%
|
|
| 2005 | 562 |
2.4%
|
|
| 2006 | 452 |
1.9%
|
|
| 2007 | 400 |
1.7%
|
|
| 2008 | 307 |
1.3%
|
|
| 2009 | 30 |
0.1%
|
|
| 9997 | inconsistent | 65 |
0.3%
|
| 9998 | dk | 444 |
1.9%
|
| 9999 | missing | 71 |
0.3%
|
| Sysmiss | 507 |
2.1%
|