Year US Dollars adjusted for inflation) 1963 7000000 1970 12000000 1978 9000000 1980 4000000 1985 8000000 1986 4000000 1993 18000000 1994 18000000 1995 27000000 1997 9000000 1999 54000000 2001 18000000 2002 54000000 2004 27000000 2005 9000000 2006 9000000 2008 1000000 2011 4000000 2016 85000000 2017 94000000 2018 15000000 2019 9000000 2021 17000000