年份 | 美国 |
---|---|
2023 | - |
2022 | 0.631847 |
2021 | 0.409259 |
2020 | 1.21265 |
2019 | 0.701868 |
2018 | 0.767437 |
2017 | 0.871785 |
2016 | 0.958268 |
2015 | 0.966675 |
2014 | 0.959431 |
2013 | 0.91451 |
2012 | 0.949566 |
2011 | 0.939505 |
2010 | 1.03534 |
2009 | 1.08529 |
2008 | 1.15619 |
2007 | 1.16307 |
2006 | 1.17797 |
2005 | 1.13588 |
2004 | 1.14389 |
2003 | 1.07836 |
2002 | 1.14842 |
2001 | 1.21338 |
2000 | 1.51201 |
1999 | 1.61296 |
1998 | 1.63763 |
1997 | 1.68198 |
1996 | 1.65278 |
1995 | 1.68647 |
1994 | 1.73098 |
1993 | 1.83118 |
1992 | 1.90863 |
1991 | 1.86738 |
1990 | 1.41026 |
1989 | 1.14036 |
1988 | 1.10702 |
1987 | 1.09324 |
1986 | 1.12532 |
1985 | 1.08769 |
1984 | 1.06779 |
1983 | 1.11946 |
1982 | 1.15882 |
1981 | 1.18734 |
1980 | 1.02199 |
1979 | 1.11715 |
1978 | 1.07179 |
1977 | 1.01935 |
1976 | 0.963796 |
1975 | 0.999565 |
1974 | 0.92724 |
1973 | 0.968059 |
1972 | 1.08411 |
1971 | 1.27928 |
1970 | 1.53115 |
1969 | 1.46799 |
1968 | 1.49576 |
1967 | 1.59282 |
1966 | 1.66556 |
1965 | 1.76765 |
1964 | 1.91344 |
1963 | 1.97056 |
1962 | 2.07649 |
1961 | 2.20057 |
1960 | - |