年份 | 美国 |
---|---|
2023 | - |
2022 | - |
2021 | 0.475066 |
2020 | 0.475811 |
2019 | 0.480422 |
2018 | 0.482614 |
2017 | 0.485162 |
2016 | 0.486551 |
2015 | 0.488388 |
2014 | 0.490283 |
2013 | 0.492164 |
2012 | 0.493847 |
2011 | 0.50183 |
2010 | 0.50987 |
2009 | 0.518532 |
2008 | 0.527552 |
2007 | 0.537063 |
2006 | 0.54972 |
2005 | 0.562644 |
2004 | 0.575522 |
2003 | 0.58851 |
2002 | 0.601397 |
2001 | 0.615506 |
2000 | 0.621514 |
1999 | 0.628469 |
1998 | 0.640854 |
1997 | 0.651339 |
1996 | 0.664477 |
1995 | 0.682892 |
1994 | 0.691452 |
1993 | 0.703096 |
1992 | 0.717622 |
1991 | 0.733952 |
1990 | 0.743826 |
1989 | 0.752479 |
1988 | 0.759684 |
1987 | 0.766613 |
1986 | 0.781921 |
1985 | 0.789181 |
1984 | 0.796205 |
1983 | 0.803128 |
1982 | 0.810506 |
1981 | 0.822584 |
1980 | 0.830696 |
1979 | 0.838706 |
1978 | 0.848013 |
1977 | 0.847043 |
1976 | 0.855239 |
1975 | 0.863404 |
1974 | 0.871959 |
1973 | 0.88269 |
1972 | 0.893514 |
1971 | 0.905996 |
1970 | 0.920425 |
1969 | 0.933722 |
1968 | 0.901817 |
1967 | 0.87809 |
1966 | 0.8939 |
1965 | 0.910948 |
1964 | 0.927442 |
1963 | 0.948912 |
1962 | 0.949378 |
1961 | 0.983336 |
1960 | - |