Year US Dollars adjusted for inflation) 1960 931000000 1961 978000000 1962 1015000000 1963 1297000000 1964 1487000000 1965 1268000000 1966 1769000000 1967 1627000000 1968 1554000000 1969 1561000000 1970 1734000000 1971 2315000000 1972 2646000000 1973 2948000000 1974 2145000000 1975 2293000000 1976 2032000000 1977 2703000000 1978 3253000000 1979 2937000000 1980 3812000000 1981 3727000000 1982 3798000000 1983 3446000000 1984 2958000000 1985 4015000000 1986 2979000000 1987 1752000000 1988 1938000000 1989 2288000000 1990 1820000000 1991 1191000000 1992 1206000000 1993 961000000 1994 857000000 1995 954000000 1996 1857000000 1997 3194000000 1998 3127000000 1999 1762000000 2000 1023000000 2001 1378000000 2002 1387000000 2003 1365000000 2004 2150000000 2005 1664000000 2006 1502000000 2007 2168000000 2008 1884000000 2009 1863000000 2010 864000000 2011 2234000000 2012 1308000000 2013 1780000000 2014 1755000000 2015 2263000000 2016 2155000000 2017 2355000000 2018 1998000000 2019 3612000000 2020 2378000000 2021 3853000000 2022 3021000000