Year current US$ 2006 1700000.04768372 2007 3000000 2008 40000000 2009 58000000 2010 52000000 2011 49000000 2012 73000000 2013 40000000 2014 66000000 2015 83000000 2016 102000000 2017 121000000 2018 115000000 2019 92000000 2020 54000000