| 年份 | 美国 |
|---|---|
| 2023 | - |
| 2022 | - |
| 2021 | 112.445 |
| 2020 | 107.931 |
| 2019 | 106.609 |
| 2018 | 104.967 |
| 2017 | 102.577 |
| 2016 | 100.707 |
| 2015 | 100 |
| 2014 | 99.6916 |
| 2013 | 98.0408 |
| 2012 | 96.6315 |
| 2011 | 94.9689 |
| 2010 | 92.7184 |
| 2009 | 91.3203 |
| 2008 | 91.8484 |
| 2007 | 89.3413 |
| 2006 | 87.0211 |
| 2005 | 84.3232 |
| 2004 | 81.4516 |
| 2003 | 79.1403 |
| 2002 | 77.4712 |
| 2001 | 76.4045 |
| 2000 | 75.0616 |
| 1999 | 73.1544 |
| 1998 | 72.0094 |
| 1997 | 71.4557 |
| 1996 | 70.3234 |
| 1995 | 69.037 |
| 1994 | 67.5719 |
| 1993 | 66.0783 |
| 1992 | 64.5739 |
| 1991 | 63.0603 |
| 1990 | 61.2587 |
| 1989 | 59.0093 |
| 1988 | 56.7586 |
| 1987 | 54.8722 |
| 1986 | 53.3475 |
| 1985 | 52.3247 |
| 1984 | 50.8856 |
| 1983 | 48.7579 |
| 1982 | 47.0239 |
| 1981 | 44.8076 |
| 1980 | 40.8809 |
| 1979 | 37.2311 |
| 1978 | 34.1873 |
| 1977 | 31.7848 |
| 1976 | 29.6926 |
| 1975 | 27.9864 |
| 1974 | 25.8827 |
| 1973 | 23.5568 |
| 1972 | 22.2178 |
| 1971 | 21.2334 |
| 1970 | 20.1563 |
| 1969 | - |
| 1968 | - |
| 1967 | - |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |