年份 | 美国 |
---|---|
2023 | - |
2022 | - |
2021 | - |
2020 | 5.43544 |
2019 | 4.98728 |
2018 | 4.92889 |
2017 | 5.12288 |
2016 | 4.80666 |
2015 | 4.94678 |
2014 | 6.12921 |
2013 | 6.22926 |
2012 | 6.25389 |
2011 | 6.49768 |
2010 | 6.69455 |
2009 | 6.7387 |
2008 | 6.43609 |
2007 | 6.24332 |
2006 | 6.16403 |
2005 | 6.17098 |
2004 | 6.25376 |
2003 | 6.32861 |
2002 | 6.35996 |
2001 | 6.29892 |
2000 | 6.08565 |
1999 | - |
1998 | - |
1997 | - |
1996 | - |
1995 | - |
1994 | - |
1993 | - |
1992 | - |
1991 | - |
1990 | - |
1989 | - |
1988 | - |
1987 | - |
1986 | - |
1985 | - |
1984 | - |
1983 | - |
1982 | - |
1981 | - |
1980 | - |
1979 | - |
1978 | - |
1977 | - |
1976 | - |
1975 | - |
1974 | - |
1973 | - |
1972 | - |
1971 | - |
1970 | - |
1969 | - |
1968 | - |
1967 | - |
1966 | - |
1965 | - |
1964 | - |
1963 | - |
1962 | - |
1961 | - |
1960 | - |