Year US Dollars adjusted for inflation) 1960 171000000 1961 1576000000 1962 1219000000 1963 1009000000 1964 740000000 1965 563000000 1966 306000000 1967 237000000 1968 336000000 1969 516000000 1970 623000000 1971 455000000 1972 376000000 1973 78000000 1974 224000000 1975 195000000 1976 53000000 1977 90000000 1978 130000000 1979 190000000 1980 441000000 1981 452000000 1982 276000000 1983 649000000 1984 646000000 1985 848000000 1986 810000000 1987 787000000 1988 712000000 1989 37000000 1990 150000000 1991 752000000 1992 407000000 1993 196000000 1994 473000000 1995 405000000 1996 419000000 1997 351000000 1998 115000000 1999 192000000 2000 576000000 2001 538000000 2002 436000000 2003 153000000 2004 353000000 2005 118000000 2006 113000000 2007 481000000 2008 423000000 2009 104000000 2010 241000000 2011 356000000 2012 207000000 2013 202000000 2014 316000000 2015 408000000 2016 252000000 2017 369000000 2018 184000000 2019 178000000 2020 220000000 2021 256000000 2022 155000000