Year current US$ 1995 2000000 1996 2000000 1997 2000000 1998 1000000 1999 4000000 2000 4000000 2001 4000000 2005 18000000 2006 16000000 2007 25000000 2008 38000000 2009 49000000 2010 22000000 2011 46000000 2012 55000000 2013 70000000 2014 72000000 2015 89000000 2016 80000000 2017 115500000 2018 155000000 2019 177899993.89648402 2020 92000000