Year US Dollars adjusted for inflation) 1960 195000000 1961 180000000 1962 132000000 1963 218000000 1964 283000000 1965 631000000 1966 570000000 1967 130000000 1968 357000000 1969 499000000 1970 93000000 1971 235000000 1972 373000000 1973 253000000 1974 450000000 1975 654000000 1976 556000000 1977 1198000000 1978 376000000 1979 1349000000 1980 914000000 1981 887000000 1982 677000000 1983 496000000 1984 524000000 1985 764000000 1986 869000000 1987 771000000 1988 1220000000 1989 1849000000 1990 1214000000 1991 921000000 1992 795000000 1993 1024000000 1994 1029000000 1995 1965000000 1996 1984000000 1997 1230000000 1998 1417000000 1999 1636000000 2000 1399000000 2001 774000000 2002 470000000 2003 752000000 2004 1051000000 2005 799000000 2006 1657000000 2007 1728000000 2008 1689000000 2009 796000000 2010 1297000000 2011 1568000000 2012 1076000000 2013 189000000 2014 738000000 2015 256000000 2016 1038000000 2017 962000000 2018 1140000000 2019 1495000000 2020 1276000000 2021 798000000 2022 408000000