Year US Dollars adjusted for inflation) 1960 22000000 1961 37000000 1962 93000000 1963 14000000 1964 16000000 1965 82000000 1966 159000000 1967 147000000 1968 87000000 1969 41000000 1970 80000000 1971 1000000 1973 21000000 1974 198000000 1975 207000000 1976 216000000 1977 408000000 1978 419000000 1979 725000000 1980 467000000 1981 798000000 1982 527000000 1983 394000000 1984 72000000 1985 50000000 1986 31000000 1987 32000000 1988 111000000 1989 126000000 1990 137000000 1991 62000000 1992 17000000 1993 98000000 1994 117000000 1995 28000000 1996 89000000 1997 220000000 1999 60000000 2000 125000000 2001 11000000 2002 155000000 2003 12000000 2004 14000000 2005 101000000 2006 47000000 2007 27000000 2008 46000000 2009 39000000 2010 309000000 2011 1406000000 2012 879000000 2013 62000000 2014 572000000 2015 47000000 2016 287000000 2017 605000000 2018 462000000 2019 48000000 2020 12000000 2021 235000000 2022 352000000