Year US Dollars adjusted for inflation) 1962 6000000 1964 4000000 1967 0 1968 8000000 1970 0 1972 11000000 1976 1000000 1979 8000000 1980 1000000 1981 27000000 1982 3000000 1983 1000000 1987 4000000 1988 0 1990 6000000 1991 0 1993 13000000 1994 5000000 1995 5000000 2000 2000000 2002 2000000 2006 2000000 2011 1000000