Year US Dollars adjusted for inflation) 1960 33000000 1961 0 1963 0 1964 0 1965 17000000 1967 6000000 1969 0 1970 1000000 1971 4000000 1972 4000000 1973 18000000 1974 24000000 1975 2000000 1976 18000000 1977 8000000 1978 45000000 1979 69000000 1981 1000000 1982 1000000 1983 1000000 1986 39000000 1989 40000000 1990 1000000 1991 1000000 1998 4000000 2000 18000000 2001 6000000 2003 2000000 2005 1000000 2007 0 2010 5000000 2011 1000000 2012 4000000 2014 5000000 2017 2000000 2018 1000000 2019 4000000 2021 1000000