Year US Dollars adjusted for inflation) 1963 0 1965 1000000 1966 1000000 1967 0 1968 20000000 1969 3000000 1970 9000000 1971 1000000 1973 1000000 1974 29000000 1975 46000000 1976 19000000 1977 10000000 1978 3000000 1979 11000000 1980 12000000 1981 5000000 1982 32000000 1983 15000000 1984 60000000 1985 41000000 1986 5000000 1991 21000000 1992 4000000 1993 2000000 1995 4000000 1996 4000000 1998 2000000 2002 19000000 2003 10000000 2008 3000000 2012 2000000 2014 20000000 2017 1000000 2018 1000000 2019 2000000 2020 4000000 2021 4000000 2022 7000000