年份 | 美国 |
---|---|
2023 | - |
2022 | 6.36795 |
2021 | 6.52692 |
2020 | 6.66387 |
2019 | 6.74097 |
2018 | 6.78137 |
2017 | 6.8167 |
2016 | 6.83261 |
2015 | 6.82127 |
2014 | 6.79597 |
2013 | 6.75251 |
2012 | 6.6661 |
2011 | 6.64879 |
2010 | 6.56615 |
2009 | 6.31016 |
2008 | 6.12617 |
2007 | 6.09199 |
2006 | 5.97678 |
2005 | 5.78162 |
2004 | 5.67285 |
2003 | 5.53287 |
2002 | 5.2916 |
2001 | 4.99228 |
2000 | 4.80042 |
1999 | 4.70108 |
1998 | 4.56776 |
1997 | 4.42846 |
1996 | 4.35731 |
1995 | 4.30808 |
1994 | 4.25003 |
1993 | 4.2108 |
1992 | 4.19708 |
1991 | 4.21379 |
1990 | 4.2522 |
1989 | 4.35452 |
1988 | 4.46665 |
1987 | 4.56668 |
1986 | 4.7036 |
1985 | 4.81046 |
1984 | 4.83709 |
1983 | 4.97905 |
1982 | 5.14172 |
1981 | 5.14437 |
1980 | 5.20271 |
1979 | 5.35052 |
1978 | 5.29273 |
1977 | 5.12166 |
1976 | 5.08347 |
1975 | 5.02331 |
1974 | 4.89653 |
1973 | 4.85526 |
1972 | 4.92967 |
1971 | 5.01229 |
1970 | 5.07776 |
1969 | 5.12035 |
1968 | 5.14623 |
1967 | 5.14872 |
1966 | 5.07995 |
1965 | 5.01538 |
1964 | 4.97586 |
1963 | 4.87934 |
1962 | 4.81991 |
1961 | 4.81042 |
1960 | 4.753 |