| Value | Category | Cases | |
|---|---|---|---|
| 1957 | 1 |
0.1%
|
|
| 1972 | 1 |
0.1%
|
|
| 1973 | 2 |
0.1%
|
|
| 1974 | 4 |
0.3%
|
|
| 1975 | 6 |
0.4%
|
|
| 1976 | 12 |
0.8%
|
|
| 1977 | 18 |
1.2%
|
|
| 1978 | 22 |
1.5%
|
|
| 1979 | 25 |
1.7%
|
|
| 1980 | 33 |
2.2%
|
|
| 1981 | 24 |
1.6%
|
|
| 1982 | 27 |
1.8%
|
|
| 1983 | 35 |
2.3%
|
|
| 1984 | 32 |
2.1%
|
|
| 1985 | 43 |
2.8%
|
|
| 1986 | 29 |
1.9%
|
|
| 1987 | 34 |
2.2%
|
|
| 1988 | 36 |
2.4%
|
|
| 1989 | 32 |
2.1%
|
|
| 1990 | 41 |
2.7%
|
|
| 1991 | 29 |
1.9%
|
|
| 1992 | 37 |
2.4%
|
|
| 1993 | 26 |
1.7%
|
|
| 1994 | 52 |
3.4%
|
|
| 1995 | 53 |
3.5%
|
|
| 1996 | 40 |
2.6%
|
|
| 1997 | 41 |
2.7%
|
|
| 1998 | 48 |
3.2%
|
|
| 1999 | 56 |
3.7%
|
|
| 2000 | 64 |
4.2%
|
|
| 2001 | 46 |
3%
|
|
| 2002 | 65 |
4.3%
|
|
| 2003 | 57 |
3.8%
|
|
| 2004 | 53 |
3.5%
|
|
| 2005 | 62 |
4.1%
|
|
| 2006 | 67 |
4.4%
|
|
| 2007 | 76 |
5%
|
|
| 2008 | 56 |
3.7%
|
|
| 2009 | 85 |
5.6%
|
|
| 2010 | 45 |
3%
|
|
| 9998 | D/K year | 0 |
0%
|
| 9999 | N/A | 0 |
0%
|
| Sysmiss | 482 |