Year US Dollars adjusted for inflation) 1996 20000000 1997 5000000 2001 16000000 2006 5000000 2007 5000000 2008 45000000 2009 0 2010 31000000 2011 4000000 2012 10000000 2013 10000000 2014 10000000 2015 35000000 2016 29000000 2017 3000000 2018 27000000 2019 26000000 2020 34000000 2021 3000000