年份 | 美国 |
---|---|
2023 | - |
2022 | 6.78265 |
2021 | 6.74716 |
2020 | 6.74042 |
2019 | 6.75167 |
2018 | 6.75938 |
2017 | 6.77265 |
2016 | 6.79641 |
2015 | 6.82591 |
2014 | 6.88063 |
2013 | 6.97709 |
2012 | 7.11198 |
2011 | 7.27855 |
2010 | 7.43395 |
2009 | 7.5456 |
2008 | 7.61099 |
2007 | 7.62743 |
2006 | 7.61174 |
2005 | 7.58042 |
2004 | 7.53916 |
2003 | 7.50802 |
2002 | 7.48807 |
2001 | 7.47758 |
2000 | 7.48443 |
1999 | 7.50507 |
1998 | 7.51433 |
1997 | 7.48009 |
1996 | 7.39767 |
1995 | 7.29057 |
1994 | 7.19565 |
1993 | 7.14579 |
1992 | 7.16856 |
1991 | 7.31893 |
1990 | 7.5706 |
1989 | 7.79894 |
1988 | 7.9806 |
1987 | 8.13206 |
1986 | 8.23446 |
1985 | 8.31055 |
1984 | 8.4592 |
1983 | 8.70331 |
1982 | 8.99711 |
1981 | 9.33104 |
1980 | 9.64956 |
1979 | 9.87114 |
1978 | 10.0132 |
1977 | 10.1263 |
1976 | 10.1893 |
1975 | 10.18 |
1974 | 10.1302 |
1973 | 10.0563 |
1972 | 9.93036 |
1971 | 9.96874 |
1970 | 9.85393 |
1969 | 9.43123 |
1968 | 9.14225 |
1967 | 9.03309 |
1966 | 8.81616 |
1965 | 8.59179 |
1964 | 8.50493 |
1963 | 8.35053 |
1962 | 8.08299 |
1961 | 7.63192 |
1960 | 7.35121 |