Year US Dollars adjusted for inflation) 1965 1000000 1966 8000000 1968 6000000 1969 138000000 1970 92000000 1971 165000000 1972 177000000 1973 99000000 1974 295000000 1975 255000000 1976 254000000 1977 171000000 1978 50000000 1979 338000000 1980 410000000 1981 167000000 1982 176000000 1983 245000000 1984 83000000 1985 123000000 1986 75000000 1987 277000000 1988 542000000 1989 233000000 1990 522000000 1991 370000000 1992 111000000 1993 170000000 1994 179000000 1995 302000000 1996 165000000 1997 619000000 1998 804000000 1999 308000000 2000 788000000 2001 247000000 2002 232000000 2003 83000000 2004 377000000 2005 542000000 2006 73000000 2007 356000000 2008 1110000000 2009 1426000000 2010 962000000 2011 891000000 2012 748000000 2013 755000000 2014 66000000 2015 152000000 2016 636000000 2017 403000000 2018 568000000 2019 489000000 2020 154000000 2021 156000000 2022 361000000