年份 | 美国 |
---|---|
2023 | - |
2022 | - |
2021 | 5.4 |
2020 | 5.4 |
2019 | 5.5 |
2018 | 5.6 |
2017 | 5.7 |
2016 | 5.7 |
2015 | 5.8 |
2014 | 5.9 |
2013 | 6 |
2012 | 6 |
2011 | 6.1 |
2010 | 6.2 |
2009 | 6.4 |
2008 | 6.5 |
2007 | 6.6 |
2006 | 6.7 |
2005 | 6.7 |
2004 | 6.8 |
2003 | 6.9 |
2002 | 6.9 |
2001 | 7 |
2000 | 7.1 |
1999 | 7.2 |
1998 | 7.4 |
1997 | 7.5 |
1996 | 7.7 |
1995 | 7.9 |
1994 | 8.2 |
1993 | 8.5 |
1992 | 8.8 |
1991 | 9.1 |
1990 | 9.4 |
1989 | 9.7 |
1988 | 9.9 |
1987 | 10.2 |
1986 | 10.4 |
1985 | 10.6 |
1984 | 10.9 |
1983 | 11.3 |
1982 | 11.7 |
1981 | 12.1 |
1980 | 12.6 |
1979 | 13.2 |
1978 | 13.8 |
1977 | 14.5 |
1976 | 15.2 |
1975 | 15.9 |
1974 | 16.7 |
1973 | 17.5 |
1972 | 18.3 |
1971 | 19.1 |
1970 | 19.9 |
1969 | 20.6 |
1968 | 21.3 |
1967 | 22 |
1966 | 22.7 |
1965 | 23.3 |
1964 | 23.8 |
1963 | 24.4 |
1962 | 24.9 |
1961 | 25.4 |
1960 | 25.9 |