Year US Dollars adjusted for inflation) 1972 0 1973 0 1978 8000000 1980 1000000 1992 13000000 1995 0 1996 1000000 1997 6000000 1998 0 2000 0 2001 0 2002 4000000 2004 4000000 2005 18000000 2011 8000000 2012 8000000 2014 12000000 2015 10000000 2016 6000000 2017 8000000 2022 45000000