年份 | 美国 |
---|---|
2023 | - |
2022 | 0.651673 |
2021 | 0.618595 |
2020 | 0.503466 |
2019 | 0.43511 |
2018 | 0.627411 |
2017 | 6.803 |
2016 | 0.574954 |
2015 | 0.580888 |
2014 | 0.565746 |
2013 | 0.659561 |
2012 | 0.516844 |
2011 | 0.371626 |
2010 | 0.610642 |
2009 | 0.9083 |
2008 | 1.07984 |
2007 | 0.979869 |
2006 | 1.081 |
2005 | 1.06862 |
2004 | 1.19587 |
2003 | 1.14294 |
2002 | 1.33137 |
2001 | 1.35359 |
2000 | 1.37536 |
1999 | 1.45808 |
1998 | 1.33998 |
1997 | 1.1919 |
1996 | 1.12351 |
1995 | 1.02873 |
1994 | 1.14473 |
1993 | 1.01639 |
1992 | 0.970025 |
1991 | 0.965767 |
1990 | 1.06113 |
1989 | 0.837991 |
1988 | 0.790592 |
1987 | 0.825438 |
1986 | 0.848045 |
1985 | 0.813696 |
1984 | 0.839459 |
1983 | 0.92757 |
1982 | 1.21284 |
1981 | 1.06285 |
1980 | 1.17425 |
1979 | 1.10925 |
1978 | 1.2723 |
1977 | 1.97678 |
1976 | 1.68135 |
1975 | 1.5842 |
1974 | 1.82264 |
1973 | 2.02099 |
1972 | 2.54804 |
1971 | - |
1970 | - |
1969 | - |
1968 | - |
1967 | - |
1966 | - |
1965 | - |
1964 | - |
1963 | - |
1962 | - |
1961 | - |
1960 | - |