Year US Dollars adjusted for inflation) 1968 0 1971 2000000 1974 2000000 1975 0 1976 15000000 1977 5000000 1978 1000000 1979 5000000 1980 4000000 1981 14000000 1983 3000000 1984 7000000 1985 23000000 2001 7000000 2002 2000000 2008 0 2018 0 2019 2000000 2021 5000000