| 年份 | 美国 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 9.39934 |
| 2020 | 8.31131 |
| 2019 | 8.84381 |
| 2018 | 8.78786 |
| 2017 | 8.98349 |
| 2016 | 8.90026 |
| 2015 | 8.29217 |
| 2014 | 8.07389 |
| 2013 | 8.25259 |
| 2012 | - |
| 2011 | - |
| 2010 | - |
| 2009 | - |
| 2008 | - |
| 2007 | - |
| 2006 | - |
| 2005 | - |
| 2004 | - |
| 2003 | - |
| 2002 | - |
| 2001 | - |
| 2000 | - |
| 1999 | 11.5757 |
| 1998 | 11.5779 |
| 1997 | - |
| 1996 | 11.5622 |
| 1995 | 11.7503 |
| 1994 | 9.83202 |
| 1993 | 10.4855 |
| 1992 | - |
| 1991 | 10.4418 |
| 1990 | 11.9889 |
| 1989 | - |
| 1988 | - |
| 1987 | 11.2455 |
| 1986 | 11.7394 |
| 1985 | 10.6699 |
| 1984 | 11.4617 |
| 1983 | - |
| 1982 | - |
| 1981 | - |
| 1980 | - |
| 1979 | - |
| 1978 | - |
| 1977 | - |
| 1976 | 19.2945 |
| 1975 | - |
| 1974 | - |
| 1973 | 17.053 |
| 1972 | 18.1306 |
| 1971 | 19.195 |
| 1970 | - |
| 1969 | - |
| 1968 | - |
| 1967 | - |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |