年份 | 美国 |
---|---|
2023 | - |
2022 | - |
2021 | 10.8927 |
2020 | 10.2021 |
2019 | 11.8725 |
2018 | 12.361 |
2017 | 12.2617 |
2016 | 11.9395 |
2015 | 12.461 |
2014 | 13.546 |
2013 | 13.5781 |
2012 | 13.644 |
2011 | 13.5635 |
2010 | 12.3414 |
2009 | 10.9322 |
2008 | 12.4258 |
2007 | 11.4638 |
2006 | 10.6414 |
2005 | 9.98205 |
2004 | 9.62875 |
2003 | 9.03566 |
2002 | 9.13138 |
2001 | 9.70345 |
2000 | 10.6928 |
1999 | 10.3093 |
1998 | 10.5153 |
1997 | 11.1198 |
1996 | 10.7466 |
1995 | 10.6392 |
1994 | 9.89315 |
1993 | 9.54718 |
1992 | 9.70891 |
1991 | 9.6609 |
1990 | 9.25473 |
1989 | 8.93879 |
1988 | 8.49052 |
1987 | 7.49592 |
1986 | 7.00925 |
1985 | 6.98807 |
1984 | 7.48908 |
1983 | 7.62226 |
1982 | 8.46973 |
1981 | 9.51778 |
1980 | 9.82646 |
1979 | 8.75903 |
1978 | 7.94706 |
1977 | 7.65429 |
1976 | 7.98089 |
1975 | 8.23228 |
1974 | 8.19612 |
1973 | 6.68378 |
1972 | 5.53846 |
1971 | 5.40525 |
1970 | 5.56311 |
1969 | - |
1968 | - |
1967 | - |
1966 | - |
1965 | - |
1964 | - |
1963 | - |
1962 | - |
1961 | - |
1960 | - |