Year US Dollars adjusted for inflation) 1960 1508.44269 1961 1482.51983 1962 1400.83957 1963 1401.46217 1964 1523.54145 1965 1722.08031 1966 1576.2662 1967 1649.19771 1968 1618.48133 1969 1560.80535 1970 1582.77318 1971 1528.73609 1972 1612.68811 1973 1542.14233 1974 1584.67268 1975 1495.65805 1976 1534.84991 1977 1415.59827 1978 1375.87752 1979 1289.66047 1980 1284.25129 1981 1317.60386 1982 1237.59119 1983 1173.09858 1984 1131.45991 1985 1113.95656 1986 1088.30907 1987 1084.89525 1988 1120.50951 1989 1078.70477 1990 1044.97061 1991 1017.65597 1992 974.89386 1993 1015.11139 1994 903.89152 1995 905.55464 1996 935.52994 1997 943.85547 1998 913.41236 1999 928.86358 2000 938.35116 2001 961.49993 2002 978.05343 2003 1018.36197 2004 1061.19773 2005 1107.72817 2006 1163.30273 2007 1226.54055 2008 1285.86453 2009 1365.40234 2010 1463.21357 2011 1499.72831 2012 1565.90033 2013 1595.91504 2014 1620.82329 2015 1618.45767 2016 1629.5903 2017 1646.14384