Year US Dollars adjusted for inflation) 1961 3000000 1962 1000000 1963 1000000 1966 2000000 1967 3000000 1968 26000000 1969 2000000 1970 7000000 1971 17000000 1972 1000000 1974 18000000 1977 22000000 1978 16000000 1979 38000000 1980 55000000 1981 18000000 1984 9000000 1989 2000000 1992 0 1995 2000000 1997 0 1999 2000000 2000 0 2002 31000000 2003 61000000 2004 9000000 2014 6000000 2015 5000000 2016 5000000 2017 14000000 2018 9000000 2019 15000000 2020 3000000 2021 10000000 2022 16000000