Year US Dollars adjusted for inflation) 1960 191000000 1961 96000000 1962 14000000 1963 24000000 1964 18000000 1965 52000000 1966 65000000 1967 26000000 1968 188000000 1969 89000000 1970 35000000 1971 157000000 1972 184000000 1973 458000000 1974 555000000 1975 548000000 1976 372000000 1977 933000000 1978 748000000 1979 639000000 1980 697000000 1981 858000000 1982 271000000 1983 317000000 1984 356000000 1985 213000000 1986 250000000 1987 614000000 1988 240000000 1989 10000000 1990 97000000 1991 107000000 1992 124000000 1993 42000000 1994 175000000 1995 46000000 1996 119000000 1997 373000000 1998 51000000 1999 96000000 2000 18000000 2001 10000000 2002 16000000 2003 22000000 2004 47000000 2005 368000000 2006 193000000 2007 172000000 2009 43000000 2010 46000000 2011 68000000 2012 5000000 2013 15000000 2014 149000000 2015 201000000 2016 202000000 2017 64000000 2018 103000000 2019 0 2020 28000000 2021 97000000 2022 26000000