年份 | 美国 |
---|---|
2023 | - |
2022 | 6.36864 |
2021 | 6.39037 |
2020 | 6.37403 |
2019 | 6.40058 |
2018 | 6.49633 |
2017 | 6.62158 |
2016 | 6.76931 |
2015 | 6.91801 |
2014 | 7.01997 |
2013 | 7.08038 |
2012 | 7.13014 |
2011 | 7.16314 |
2010 | 7.15939 |
2009 | 7.12625 |
2008 | 7.06709 |
2007 | 6.95824 |
2006 | 6.94601 |
2005 | 6.85361 |
2004 | 6.57325 |
2003 | 6.37636 |
2002 | 6.29199 |
2001 | 6.12203 |
2000 | 5.93103 |
1999 | 5.82911 |
1998 | 5.70572 |
1997 | 5.5285 |
1996 | 5.23658 |
1995 | 5.04733 |
1994 | 4.99815 |
1993 | 4.87782 |
1992 | 4.72949 |
1991 | 4.70339 |
1990 | 4.68841 |
1989 | 4.60991 |
1988 | 4.61382 |
1987 | 4.67358 |
1986 | 4.74569 |
1985 | 4.91027 |
1984 | 5.20776 |
1983 | 5.41217 |
1982 | 5.51749 |
1981 | 5.6088 |
1980 | 5.55282 |
1979 | 5.34923 |
1978 | 5.30891 |
1977 | 5.38396 |
1976 | 5.33873 |
1975 | 5.38819 |
1974 | 5.57594 |
1973 | 5.54515 |
1972 | 5.36892 |
1971 | 5.35358 |
1970 | 5.33255 |
1969 | 5.22857 |
1968 | 5.1875 |
1967 | 5.25349 |
1966 | 5.30814 |
1965 | 5.34304 |
1964 | 5.36838 |
1963 | 5.39427 |
1962 | 5.40888 |
1961 | 5.35168 |
1960 | 5.30267 |