Year US Dollars adjusted for inflation) 1964 4000000 1965 4000000 1966 22000000 1967 1000000 1970 11000000 1971 60000000 1972 47000000 1973 118000000 1974 182000000 1975 48000000 1977 44000000 1978 63000000 1979 260000000 1980 53000000 1981 121000000 1982 9000000 1986 1000000 1989 5000000 1992 18000000 1994 4000000 1996 4000000 2000 2000000 2002 1000000 2003 51000000 2005 10000000 2006 12000000 2007 1000000 2009 25000000 2011 78000000 2012 115000000 2013 118000000 2014 14000000 2015 20000000 2016 20000000 2017 2000000 2018 16000000 2020 8000000 2021 52000000