Year US Dollars adjusted for inflation) 1960 38000000 1962 25000000 1963 55000000 1964 67000000 1965 65000000 1966 80000000 1967 140000000 1968 65000000 1969 53000000 1971 4000000 1972 29000000 1973 10000000 1975 8000000 1976 8000000 1977 8000000 1978 87000000 1979 153000000 1980 152000000 1981 268000000 1982 66000000 1983 35000000 1985 42000000 1986 29000000 1987 54000000 1988 34000000 1989 127000000 1990 85000000 1991 170000000 1992 82000000 1993 51000000 1994 64000000 1995 21000000 1996 4000000 1997 19000000 1998 3000000 1999 5000000 2000 3000000 2001 42000000 2002 92000000 2003 101000000 2004 66000000 2005 6000000 2006 17000000 2007 58000000 2008 108000000 2009 151000000 2010 159000000 2011 150000000 2012 169000000 2013 173000000 2014 163000000 2015 217000000 2016 129000000 2017 146000000 2018 59000000 2019 31000000 2020 72000000 2021 119000000 2022 88000000