Year US Dollars adjusted for inflation) 1964 0 1965 0 1966 1000000 1967 1000000 1968 1000000 1969 1000000 1970 1000000 1971 1000000 1972 1000000 1973 1000000 1974 0 1975 0 1978 37000000 1979 126000000 1980 54000000 1981 70000000 1982 61000000 1983 58000000 1984 60000000 1985 248000000 1986 40000000 1987 30000000 1988 12000000 1989 12000000 1990 30000000 1991 20000000 1992 20000000 1993 10000000 1994 17000000 1996 18000000 1997 1000000 1998 29000000 1999 23000000 2000 23000000 2001 17000000 2002 83000000 2003 2000000 2004 3000000 2005 3000000 2006 62000000 2007 99000000 2008 15000000 2009 44000000 2010 53000000 2011 52000000 2012 23000000 2013 28000000 2014 16000000 2015 10000000 2016 17000000 2017 22000000 2018 7000000 2019 3000000 2020 9000000 2021 23000000 2022 14000000