Year US Dollars adjusted for inflation) 1960 42000000 1961 69000000 1962 88000000 1963 181000000 1964 85000000 1965 214000000 1966 594000000 1967 153000000 1968 418000000 1969 559000000 1970 423000000 1971 553000000 1972 664000000 1973 162000000 1974 225000000 1975 229000000 1976 274000000 1977 264000000 1978 649000000 1979 690000000 1980 854000000 1981 485000000 1982 537000000 1983 777000000 1984 856000000 1985 747000000 1986 280000000 1987 616000000 1988 411000000 1989 962000000 1990 623000000 1991 498000000 1992 352000000 1993 972000000 1994 862000000 1995 365000000 1996 500000000 1997 692000000 1998 699000000 1999 868000000 2000 176000000 2001 412000000 2002 559000000 2003 645000000 2004 465000000 2005 431000000 2006 324000000 2007 694000000 2008 1073000000 2009 1192000000 2010 2231000000 2011 1146000000 2012 1024000000 2013 1105000000 2014 860000000 2015 771000000 2016 830000000 2017 868000000 2018 886000000 2019 733000000 2020 688000000 2021 1180000000 2022 1565000000