年份 | 美国 |
---|---|
2023 | - |
2022 | 6.54493 |
2021 | 6.67898 |
2020 | 6.77681 |
2019 | 6.82481 |
2018 | 6.82953 |
2017 | 6.80373 |
2016 | 6.77427 |
2015 | 6.78269 |
2014 | 6.81554 |
2013 | 6.84646 |
2012 | 6.88509 |
2011 | 6.93315 |
2010 | 6.98124 |
2009 | 7.04031 |
2008 | 7.1257 |
2007 | 7.24031 |
2006 | 7.37434 |
2005 | 7.50859 |
2004 | 7.61969 |
2003 | 7.67733 |
2002 | 7.67424 |
2001 | 7.63683 |
2000 | 7.58768 |
1999 | 7.52937 |
1998 | 7.48128 |
1997 | 7.45845 |
1996 | 7.45708 |
1995 | 7.46995 |
1994 | 7.48931 |
1993 | 7.48546 |
1992 | 7.43626 |
1991 | 7.34948 |
1990 | 7.24618 |
1989 | 7.16599 |
1988 | 7.12734 |
1987 | 7.14722 |
1986 | 7.28165 |
1985 | 7.52703 |
1984 | 7.7732 |
1983 | 7.98941 |
1982 | 8.18386 |
1981 | 8.30816 |
1980 | 8.408 |
1979 | 8.60113 |
1978 | 8.903 |
1977 | 9.25619 |
1976 | 9.61993 |
1975 | 9.95143 |
1974 | 10.1869 |
1973 | 10.335 |
1972 | 10.4624 |
1971 | 10.559 |
1970 | 10.603 |
1969 | 10.6051 |
1968 | 10.5538 |
1967 | 10.4126 |
1966 | 10.424 |
1965 | 10.2964 |
1964 | 9.88747 |
1963 | 9.65736 |
1962 | 9.63536 |
1961 | 9.48707 |
1960 | 9.30774 |