年份 | 美国 |
---|---|
2023 | - |
2022 | - |
2021 | 1.27994 |
2020 | 0.329506 |
2019 | 0.557098 |
2018 | 0.595679 |
2017 | 0.427546 |
2016 | 0.303325 |
2015 | 0.234372 |
2014 | 0.703154 |
2013 | 0.750834 |
2012 | 0.776694 |
2011 | 1.23503 |
2010 | 0.968704 |
2009 | 0.743921 |
2008 | 1.92914 |
2007 | 1.07811 |
2006 | 1.13066 |
2005 | 1.49664 |
2004 | 1.25369 |
2003 | 1.04592 |
2002 | 0.689227 |
2001 | 0.915678 |
2000 | 1.11329 |
1999 | 0.642859 |
1998 | 0.548987 |
1997 | 0.845706 |
1996 | 0.999136 |
1995 | 0.81517 |
1994 | 0.761583 |
1993 | 0.892085 |
1992 | 0.935695 |
1991 | 0.908449 |
1990 | 1.23251 |
1989 | 1.07194 |
1988 | 0.968882 |
1987 | 1.21731 |
1986 | 0.91013 |
1985 | 2.09298 |
1984 | 2.33921 |
1983 | 2.6667 |
1982 | 2.39193 |
1981 | 4.04888 |
1980 | 5.6815 |
1979 | 5.04457 |
1978 | 2.72849 |
1977 | 3.11412 |
1976 | 3.09035 |
1975 | 3.23053 |
1974 | 3.2762 |
1973 | 0.911328 |
1972 | 0.729816 |
1971 | 0.667662 |
1970 | 0.655681 |
1969 | - |
1968 | - |
1967 | - |
1966 | - |
1965 | - |
1964 | - |
1963 | - |
1962 | - |
1961 | - |
1960 | - |