Year US Dollars adjusted for inflation) 1990 78000000 1991 113000000 1994 4000000 1995 171000000 1998 1000000 1999 52000000 2000 158000000 2001 85000000 2002 592000000 2003 58000000 2004 248000000 2005 311000000 2006 38000000 2007 66000000 2008 41000000 2009 5000000 2010 261000000 2011 47000000 2012 38000000 2013 23000000 2014 6000000 2015 33000000 2016 7000000 2017 6000000 2018 9000000