| 年份 | 美国 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 76.3293 |
| 2020 | 76.9805 |
| 2019 | 78.7878 |
| 2018 | 78.639 |
| 2017 | 78.539 |
| 2016 | 78.539 |
| 2015 | 78.6902 |
| 2014 | 78.8415 |
| 2013 | 78.7415 |
| 2012 | 78.7415 |
| 2011 | 78.6415 |
| 2010 | 78.5415 |
| 2009 | 78.3902 |
| 2008 | 78.039 |
| 2007 | 77.9878 |
| 2006 | 77.6878 |
| 2005 | 77.4878 |
| 2004 | 77.4878 |
| 2003 | 77.0366 |
| 2002 | 76.9366 |
| 2001 | 76.8366 |
| 2000 | 76.6366 |
| 1999 | 76.5829 |
| 1998 | 76.5805 |
| 1997 | 76.4293 |
| 1996 | 76.0268 |
| 1995 | 75.6219 |
| 1994 | 75.6195 |
| 1993 | 75.4195 |
| 1992 | 75.6171 |
| 1991 | 75.3659 |
| 1990 | 75.2146 |
| 1989 | 75.0171 |
| 1988 | 74.7659 |
| 1987 | 74.7659 |
| 1986 | 74.6146 |
| 1985 | 74.5634 |
| 1984 | 74.5634 |
| 1983 | 74.4634 |
| 1982 | 74.361 |
| 1981 | 74.0098 |
| 1980 | 73.6098 |
| 1979 | 73.8049 |
| 1978 | 73.3561 |
| 1977 | 73.2561 |
| 1976 | 72.8561 |
| 1975 | 72.6049 |
| 1974 | 71.9561 |
| 1973 | 71.3561 |
| 1972 | 71.1561 |
| 1971 | 71.1073 |
| 1970 | 70.8073 |
| 1969 | 70.5073 |
| 1968 | 69.9512 |
| 1967 | 70.561 |
| 1966 | 70.2122 |
| 1965 | 70.2146 |
| 1964 | 70.1659 |
| 1963 | 69.9171 |
| 1962 | 70.1195 |
| 1961 | 70.2707 |
| 1960 | 69.7707 |