Year US Dollars adjusted for inflation) 1960 26000000 1961 34000000 1962 38000000 1963 139000000 1964 118000000 1965 152000000 1966 216000000 1967 1422000000 1968 2288000000 1969 2570000000 1970 60000000 1971 171000000 1972 217000000 1973 234000000 1974 319000000 1975 337000000 1976 251000000 1977 256000000 1978 179000000 1979 219000000 1980 544000000 1981 800000000 1982 756000000 1983 286000000 1984 633000000 1985 355000000 1986 273000000 1987 207000000 1988 281000000 1989 209000000 1990 120000000 1991 940000000 1992 1134000000 1993 783000000 1994 411000000 1995 496000000 1996 568000000 1997 496000000 1998 752000000 1999 132000000 2000 937000000 2001 1282000000 2002 720000000 2003 769000000 2004 215000000 2005 31000000 2006 375000000 2007 868000000 2008 570000000 2009 399000000 2010 502000000 2011 389000000 2012 595000000 2013 509000000 2014 217000000 2015 423000000 2016 282000000 2017 1002000000 2018 518000000 2019 342000000 2020 652000000 2021 878000000 2022 799000000