Year US Dollars adjusted for inflation) 1961 1000000 1964 1000000 1965 0 1966 0 1968 0 1969 1000000 1970 1000000 1971 1000000 1975 14000000 1976 8000000 1977 9000000 1980 0 1981 9000000 1982 1000000 1983 16000000 1984 9000000 1985 2000000 1986 3000000 1988 12000000 1991 2000000 1993 7000000 1999 0 2005 12000000 2006 4000000 2007 4000000 2009 3000000 2010 0 2011 15000000 2012 3000000 2015 5000000 2016 7000000 2017 2000000 2018 23000000 2019 7000000 2020 2000000 2021 28000000 2022 1000000