| 年份 | 美国 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | - |
| 2020 | 92.267 |
| 2019 | 79.455 |
| 2018 | 80.593 |
| 2017 | 81.986 |
| 2016 | 82.097 |
| 2015 | 80.429 |
| 2014 | 79.372 |
| 2013 | 78.083 |
| 2012 | 77.717 |
| 2011 | 77.926 |
| 2010 | 77.159 |
| 2009 | 79.055 |
| 2008 | 78.705 |
| 2007 | 79.447 |
| 2006 | 80.928 |
| 2005 | 81.507 |
| 2004 | 81.47 |
| 2003 | 83.557 |
| 2002 | 83.72 |
| 2001 | 84.172 |
| 2000 | 83.359 |
| 1999 | 83.804 |
| 1998 | 83.564 |
| 1997 | 85.4 |
| 1996 | 87.123 |
| 1995 | 89.372 |
| 1994 | 89.515 |
| 1993 | 90.066 |
| 1992 | 88.984 |
| 1991 | 90.652 |
| 1990 | 90.868 |
| 1989 | 92.515 |
| 1988 | 94.402 |
| 1987 | 94.286 |
| 1986 | 94.575 |
| 1985 | 95.529 |
| 1984 | 96.122 |
| 1983 | 97.093 |
| 1982 | 97.53 |
| 1981 | 100.866 |
| 1980 | 102.561 |
| 1979 | 102.067 |
| 1978 | 105.872 |
| 1977 | 107.656 |
| 1976 | 110.078 |
| 1975 | 112.933 |
| 1974 | 117.149 |
| 1973 | 122.92 |
| 1972 | 124.305 |
| 1971 | 125.887 |
| 1970 | 128.466 |
| 1969 | 128.864 |
| 1968 | 130.822 |
| 1967 | 127.484 |
| 1966 | 128.744 |
| 1965 | 128.619 |
| 1964 | 129.095 |
| 1963 | 130.297 |
| 1962 | 128.623 |
| 1961 | 126.608 |
| 1960 | 130.63 |