年份 | 美国 |
---|---|
2023 | - |
2022 | 5.92576 |
2021 | 5.99793 |
2020 | 6.14774 |
2019 | 6.29682 |
2018 | 6.41158 |
2017 | 6.49373 |
2016 | 6.52766 |
2015 | 6.5456 |
2014 | 6.62272 |
2013 | 6.77234 |
2012 | 6.94286 |
2011 | 7.12427 |
2010 | 7.29819 |
2009 | 7.41103 |
2008 | 7.47211 |
2007 | 7.52417 |
2006 | 7.55414 |
2005 | 7.54219 |
2004 | 7.5082 |
2003 | 7.45631 |
2002 | 7.3566 |
2001 | 7.34255 |
2000 | 7.25997 |
1999 | 6.97208 |
1998 | 6.76013 |
1997 | 6.72124 |
1996 | 6.59157 |
1995 | 6.38147 |
1994 | 6.29226 |
1993 | 6.17921 |
1992 | 5.93958 |
1991 | 5.61692 |
1990 | 5.43317 |
1989 | 5.36216 |
1988 | 5.2289 |
1987 | 5.06763 |
1986 | 4.98224 |
1985 | 4.92462 |
1984 | 4.85379 |
1983 | 4.80782 |
1982 | 4.79318 |
1981 | 4.81693 |
1980 | 4.87811 |
1979 | 5.01916 |
1978 | 5.13216 |
1977 | 5.20201 |
1976 | 5.34323 |
1975 | 5.47391 |
1974 | 5.49715 |
1973 | 5.66107 |
1972 | 5.86758 |
1971 | 5.87922 |
1970 | 5.93578 |
1969 | 6.08839 |
1968 | 6.01687 |
1967 | 5.8462 |
1966 | 5.8596 |
1965 | 5.85848 |
1964 | 5.78886 |
1963 | 5.8067 |
1962 | 5.93504 |
1961 | 6.06474 |
1960 | 6.16938 |