| 年份 | 美国 |
|---|---|
| 2023 | - |
| 2022 | 92.7588 |
| 2021 | 92.2749 |
| 2020 | 91.9887 |
| 2019 | 91.0244 |
| 2018 | 90.9262 |
| 2017 | 82.8122 |
| 2016 | 92.2927 |
| 2015 | 92.079 |
| 2014 | 91.8989 |
| 2013 | 91.7118 |
| 2012 | 91.8566 |
| 2011 | 92.0522 |
| 2010 | 91.3199 |
| 2009 | 90.2126 |
| 2008 | 91.9454 |
| 2007 | 92.5896 |
| 2006 | 91.8674 |
| 2005 | 91.0684 |
| 2004 | 89.7119 |
| 2003 | 89.5725 |
| 2002 | 89.6034 |
| 2001 | 90.9757 |
| 2000 | 91.1554 |
| 1999 | 90.1311 |
| 1998 | 91.0366 |
| 1997 | 90.7035 |
| 1996 | 90.2312 |
| 1995 | 89.0943 |
| 1994 | 88.3125 |
| 1993 | 88.7715 |
| 1992 | 88.6237 |
| 1991 | 89.0786 |
| 1990 | 89.8263 |
| 1989 | 90.3041 |
| 1988 | 89.3305 |
| 1987 | 89.6781 |
| 1986 | 88.5869 |
| 1985 | 87.9109 |
| 1984 | 86.6702 |
| 1983 | 86.7096 |
| 1982 | 86.7379 |
| 1981 | 86.1565 |
| 1980 | 89.0177 |
| 1979 | 89.9201 |
| 1978 | 88.8001 |
| 1977 | 87.5186 |
| 1976 | 85.9463 |
| 1975 | 86.5284 |
| 1974 | 86.1797 |
| 1973 | 85.1205 |
| 1972 | 83.9738 |
| 1971 | - |
| 1970 | - |
| 1969 | - |
| 1968 | - |
| 1967 | - |
| 1966 | - |
| 1965 | - |
| 1964 | - |
| 1963 | - |
| 1962 | - |
| 1961 | - |
| 1960 | - |