Year US Dollars adjusted for inflation) 1960 143000000 1961 544000000 1962 686000000 1963 737000000 1964 843000000 1965 950000000 1966 1533000000 1967 2238000000 1968 1269000000 1969 1235000000 1970 1674000000 1971 1984000000 1972 3256000000 1973 2556000000 1974 1077000000 1975 565000000 1976 159000000 1977 410000000 1978 135000000 1979 630000000 1980 1001000000 1981 1176000000 1982 2493000000 1983 1692000000 1984 1511000000 1985 974000000 1986 1486000000 1987 1648000000 1988 427000000 1989 297000000 1990 563000000 1991 887000000 1992 973000000 1993 1257000000 1994 2020000000 1995 1703000000 1996 969000000 1997 1040000000 1998 482000000 1999 517000000 2000 834000000 2001 829000000 2002 718000000 2003 632000000 2004 653000000 2005 799000000 2006 724000000 2007 692000000 2008 335000000 2009 161000000 2010 688000000 2011 632000000 2012 283000000 2013 678000000 2014 430000000 2015 1444000000 2016 1643000000 2017 2340000000 2018 1638000000 2019 1157000000 2020 1403000000 2021 1287000000 2022 701000000