年份 | 美国 |
---|---|
2023 | - |
2022 | 3.21117 |
2021 | 3.1273 |
2020 | 3.06385 |
2019 | 3.02381 |
2018 | 3.00597 |
2017 | 2.99961 |
2016 | 2.98529 |
2015 | 2.9703 |
2014 | 2.976 |
2013 | 2.95249 |
2012 | 2.91481 |
2011 | 2.86507 |
2010 | 2.77943 |
2009 | 2.65585 |
2008 | 2.53549 |
2007 | 2.44605 |
2006 | 2.35699 |
2005 | 2.30172 |
2004 | 2.27379 |
2003 | 2.20073 |
2002 | 2.12712 |
2001 | 2.0876 |
2000 | 2.03808 |
1999 | 1.98537 |
1998 | 1.95103 |
1997 | 1.93965 |
1996 | 1.92092 |
1995 | 1.89791 |
1994 | 1.8742 |
1993 | 1.84742 |
1992 | 1.81526 |
1991 | 1.77158 |
1990 | 1.7321 |
1989 | 1.70168 |
1988 | 1.67263 |
1987 | 1.63954 |
1986 | 1.61278 |
1985 | 1.5892 |
1984 | 1.56538 |
1983 | 1.55702 |
1982 | 1.53393 |
1981 | 1.5095 |
1980 | 1.50192 |
1979 | 1.49283 |
1978 | 1.47858 |
1977 | 1.45736 |
1976 | 1.43854 |
1975 | 1.41408 |
1974 | 1.38848 |
1973 | 1.37839 |
1972 | 1.37643 |
1971 | 1.36789 |
1970 | 1.35448 |
1969 | 1.33559 |
1968 | 1.31069 |
1967 | 1.28772 |
1966 | 1.26894 |
1965 | 1.24877 |
1964 | 1.22531 |
1963 | 1.20741 |
1962 | 1.19437 |
1961 | 1.17934 |
1960 | 1.16349 |