Year US Dollars adjusted for inflation) 1964 18000000 1965 22000000 1973 9000000 1982 5000000 1983 19000000 1984 24000000 1985 33000000 1986 40000000 1987 34000000 1988 124000000 1989 28000000 1990 70000000 1991 83000000 1992 26000000 1993 10000000 1994 39000000 1995 33000000 1996 170000000 1997 98000000 1998 7000000 1999 113000000 2000 4000000 2001 180000000 2002 66000000 2003 6000000 2004 16000000 2005 18000000 2006 20000000 2007 17000000 2010 44000000 2011 41000000 2012 6000000 2017 30000000 2019 19000000 2020 30000000 2021 11000000