年份 | 美国 |
---|---|
2023 | - |
2022 | 6.37924 |
2021 | 6.30325 |
2020 | 6.20625 |
2019 | 6.12471 |
2018 | 6.07687 |
2017 | 6.07462 |
2016 | 6.1606 |
2015 | 6.32902 |
2014 | 6.49809 |
2013 | 6.62996 |
2012 | 6.7234 |
2011 | 6.76384 |
2010 | 6.79432 |
2009 | 6.89443 |
2008 | 7.06889 |
2007 | 7.26376 |
2006 | 7.46465 |
2005 | 7.64894 |
2004 | 7.76727 |
2003 | 7.83306 |
2002 | 7.88675 |
2001 | 7.91817 |
2000 | 7.91312 |
1999 | 7.88994 |
1998 | 7.84684 |
1997 | 7.75571 |
1996 | 7.75265 |
1995 | 7.6677 |
1994 | 7.37343 |
1993 | 7.17084 |
1992 | 7.15417 |
1991 | 7.04352 |
1990 | 6.84421 |
1989 | 6.76228 |
1988 | 6.64004 |
1987 | 6.38421 |
1986 | 6.04047 |
1985 | 5.83157 |
1984 | 5.733 |
1983 | 5.57204 |
1982 | 5.38902 |
1981 | 5.2872 |
1980 | 5.22573 |
1979 | 5.15671 |
1978 | 5.12246 |
1977 | 5.12767 |
1976 | 5.14101 |
1975 | 5.17863 |
1974 | 5.32029 |
1973 | 5.44147 |
1972 | 5.52417 |
1971 | 5.6891 |
1970 | 5.85328 |
1969 | 5.91063 |
1968 | 6.11078 |
1967 | 6.34041 |
1966 | 6.34424 |
1965 | 6.40448 |
1964 | 6.59241 |
1963 | 6.55047 |
1962 | 6.40177 |
1961 | 6.45191 |
1960 | 6.48111 |