Year US Dollars adjusted for inflation) 1960 35000000 1961 108000000 1962 65000000 1963 45000000 1964 93000000 1965 39000000 1966 139000000 1967 95000000 1968 351000000 1969 113000000 1970 5000000 1971 161000000 1972 133000000 1973 206000000 1974 83000000 1975 148000000 1976 293000000 1977 448000000 1978 235000000 1979 243000000 1980 612000000 1981 801000000 1982 661000000 1983 457000000 1984 364000000 1985 180000000 1986 356000000 1987 505000000 1988 776000000 1989 558000000 1990 416000000 1991 455000000 1992 366000000 1993 458000000 1994 628000000 1995 458000000 1996 484000000 1997 608000000 1998 620000000 1999 355000000 2000 281000000 2001 199000000 2002 233000000 2003 331000000 2004 202000000 2005 504000000 2006 1143000000 2007 1219000000 2008 452000000 2009 500000000 2010 366000000 2011 541000000 2012 869000000 2013 384000000 2014 638000000 2015 469000000 2016 484000000 2017 1067000000 2018 466000000 2019 301000000 2020 462000000 2021 347000000 2022 295000000