Year US Dollars adjusted for inflation) 1960 23183.55983 1961 24443.00513 1962 24929.72538 1963 25678.42968 1964 26761.90372 1965 27958.25928 1966 28786.15969 1967 30332.24003 1968 30758.06818 1969 31882.78058 1970 32267.07968 1971 33859.12725 1972 35392.30206 1973 36738.73103 1974 37943.88496 1975 39603.70655 1976 41714.73325 1977 43267.12577 1978 44770.02104 1979 46568.72734 1980 48538.24402 1981 49144.62619 1982 49079.69043 1983 50860.85516 1984 53787.17731 1985 56604.38225 1986 58682.8271 1987 59432.93047 1988 58963.13546 1989 59329.91633 1990 60268.65794 1991 61832.41296 1992 63673.97649 1993 65097.06757 1994 67999.73271 1995 70457.6931 1996 73626.15776 1997 77097.89258 1998 78651.55088 1999 79687.50824 2000 81709.66294 2001 82992.53186 2002 83732.93894 2003 84008.9617 2004 86820.34131 2005 88494.36433 2006 89887.01952 2007 91617.27915 2008 90917.54176 2009 88259.96772 2010 87770.26684 2011 87481.14835 2012 88689.49096 2013 88538.69765 2014 89274.95614 2015 90104.04826 2016 90316.97234 2017 91218.61843