年份 | 美国 |
---|---|
2023 | - |
2022 | 54.0537 |
2021 | 53.6616 |
2020 | 53.2209 |
2019 | 52.7364 |
2018 | 52.2272 |
2017 | 51.7962 |
2016 | 51.1636 |
2015 | 50.6589 |
2014 | 50.5094 |
2013 | 50.2134 |
2012 | 49.7604 |
2011 | 49.2849 |
2010 | 49.0203 |
2009 | 48.9493 |
2008 | 48.8241 |
2007 | 48.7498 |
2006 | 48.9016 |
2005 | 49.1893 |
2004 | 49.5221 |
2003 | 49.8584 |
2002 | 50.2119 |
2001 | 50.5623 |
2000 | 50.9275 |
1999 | 51.3356 |
1998 | 51.6327 |
1997 | 51.8889 |
1996 | 52.1392 |
1995 | 52.3139 |
1994 | 52.311 |
1993 | 52.1744 |
1992 | 51.9499 |
1991 | 51.5399 |
1990 | 51.1513 |
1989 | 50.87 |
1988 | 50.3981 |
1987 | 49.9658 |
1986 | 49.9119 |
1985 | 50.0221 |
1984 | 50.0901 |
1983 | 50.2248 |
1982 | 50.4462 |
1981 | 50.6223 |
1980 | 50.9461 |
1979 | 51.5164 |
1978 | 52.2703 |
1977 | 53.125 |
1976 | 54.071 |
1975 | 55.1783 |
1974 | 56.3774 |
1973 | 57.6466 |
1972 | 59.0041 |
1971 | 60.3297 |
1970 | 61.5171 |
1969 | 62.6664 |
1968 | 63.9197 |
1967 | 64.9402 |
1966 | 66.2026 |
1965 | 67.0416 |
1964 | 66.8327 |
1963 | 66.739 |
1962 | 67.0072 |
1961 | 67.2868 |
1960 | 66.7932 |