年份 | 美国 |
---|---|
2023 | - |
2022 | - |
2021 | 14.3844 |
2020 | 14.9017 |
2019 | 14.0722 |
2018 | 13.9625 |
2017 | 13.9986 |
2016 | 14.2449 |
2015 | 14.3303 |
2014 | 14.622 |
2013 | 15.0366 |
2012 | 15.4758 |
2011 | 16.0984 |
2010 | 16.6858 |
2009 | 16.8077 |
2008 | 15.9341 |
2007 | 15.1893 |
2006 | 15.0045 |
2005 | 15.0471 |
2004 | 15.1583 |
2003 | 15.2436 |
2002 | 15.059 |
2001 | 14.5356 |
2000 | 14.024 |
1999 | 14.0318 |
1998 | 13.9869 |
1997 | 14.2293 |
1996 | 14.5283 |
1995 | 14.9448 |
1994 | 15.2061 |
1993 | 15.6453 |
1992 | 16.0787 |
1991 | 16.3176 |
1990 | 15.9008 |
1989 | 15.6238 |
1988 | 15.6682 |
1987 | 16.0012 |
1986 | 16.1146 |
1985 | 15.9171 |
1984 | 15.7204 |
1983 | 16.3838 |
1982 | 16.5839 |
1981 | 15.8102 |
1980 | 15.8768 |
1979 | 15.4036 |
1978 | 15.7667 |
1977 | 16.388 |
1976 | 16.788 |
1975 | 17.6108 |
1974 | 17.1627 |
1973 | 16.7763 |
1972 | 17.6293 |
1971 | 17.9388 |
1970 | 17.9618 |
1969 | - |
1968 | - |
1967 | - |
1966 | - |
1965 | - |
1964 | - |
1963 | - |
1962 | - |
1961 | - |
1960 | - |