Year US Dollars adjusted for inflation) 1960 113000000 1961 40000000 1962 571000000 1963 378000000 1964 537000000 1965 920000000 1966 707000000 1967 770000000 1968 450000000 1969 818000000 1970 230000000 1971 313000000 1972 63000000 1973 716000000 1974 898000000 1975 108000000 1976 91000000 1977 278000000 1978 1029000000 1979 192000000 1980 404000000 1981 449000000 1982 129000000 1983 632000000 1984 622000000 1985 511000000 1986 815000000 1987 592000000 1988 743000000 1989 692000000 1990 352000000 1991 213000000 1992 364000000 1993 448000000 1994 262000000 1995 64000000 1996 597000000 1997 35000000 1998 542000000 1999 678000000 2000 326000000 2001 1217000000 2002 643000000 2003 782000000 2004 464000000 2005 463000000 2006 731000000 2007 681000000 2008 444000000 2009 791000000 2010 1525000000 2011 1527000000 2012 819000000 2013 219000000 2014 883000000 2015 1465000000 2016 1026000000 2017 1664000000 2018 1582000000 2019 1186000000 2020 1655000000 2021 1260000000 2022 761000000