年份 | 美国 |
---|---|
2023 | - |
2022 | 57.7249 |
2021 | 55.6616 |
2020 | 52.8424 |
2019 | 52.0242 |
2018 | 51.6424 |
2017 | 49.5827 |
2016 | 54.019 |
2015 | 54.1975 |
2014 | 53.0964 |
2013 | 51.1738 |
2012 | 53.5348 |
2011 | 52.7837 |
2010 | 47.6567 |
2009 | 45.4913 |
2008 | 53.3187 |
2007 | 56.0075 |
2006 | 55.7544 |
2005 | 54.2419 |
2004 | 50.7852 |
2003 | 50.1184 |
2002 | 50.8492 |
2001 | 55.2814 |
2000 | 57.4623 |
1999 | 55.8588 |
1998 | 56.6081 |
1997 | 55.2567 |
1996 | 54.1512 |
1995 | 52.0937 |
1994 | 51.3871 |
1993 | 50.6912 |
1992 | 49.9239 |
1991 | 48.8169 |
1990 | 51.635 |
1989 | 52.4887 |
1988 | 51.4924 |
1987 | 52.3972 |
1986 | 50.0942 |
1985 | 50.0474 |
1984 | 49.4947 |
1983 | 49.9112 |
1982 | 52.6705 |
1981 | 54.2022 |
1980 | 56.5582 |
1979 | 58.039 |
1978 | 57.8606 |
1977 | 57.0117 |
1976 | 55.6388 |
1975 | 55.9202 |
1974 | 56.7827 |
1973 | 57.1739 |
1972 | 59.3576 |
1971 | - |
1970 | - |
1969 | - |
1968 | - |
1967 | - |
1966 | - |
1965 | - |
1964 | - |
1963 | - |
1962 | - |
1961 | - |
1960 | - |