年份 | 美国 |
---|---|
2023 | - |
2022 | 6.27526 |
2021 | 6.30333 |
2020 | 6.30858 |
2019 | 6.36976 |
2018 | 6.50293 |
2017 | 6.65819 |
2016 | 6.82614 |
2015 | 6.98182 |
2014 | 7.08116 |
2013 | 7.13824 |
2012 | 7.18761 |
2011 | 7.2195 |
2010 | 7.21391 |
2009 | 7.17964 |
2008 | 7.12364 |
2007 | 7.02368 |
2006 | 7.00291 |
2005 | 6.91948 |
2004 | 6.65246 |
2003 | 6.46044 |
2002 | 6.42556 |
2001 | 6.30544 |
2000 | 6.11118 |
1999 | 6.01827 |
1998 | 5.89456 |
1997 | 5.6525 |
1996 | 5.33467 |
1995 | 5.13943 |
1994 | 5.04642 |
1993 | 4.90527 |
1992 | 4.7536 |
1991 | 4.67865 |
1990 | 4.63148 |
1989 | 4.57494 |
1988 | 4.53234 |
1987 | 4.51507 |
1986 | 4.53501 |
1985 | 4.58683 |
1984 | 4.70624 |
1983 | 4.82391 |
1982 | 4.9288 |
1981 | 5.08067 |
1980 | 5.19501 |
1979 | 5.20731 |
1978 | 5.35457 |
1977 | 5.54669 |
1976 | 5.55336 |
1975 | 5.59866 |
1974 | 5.74875 |
1973 | 5.69323 |
1972 | 5.52666 |
1971 | 5.51325 |
1970 | 5.48248 |
1969 | 5.38034 |
1968 | 5.34767 |
1967 | 5.40937 |
1966 | 5.46964 |
1965 | 5.5134 |
1964 | 5.5371 |
1963 | 5.54986 |
1962 | 5.53733 |
1961 | 5.44595 |
1960 | 5.36895 |