Year current US$ 2005 3200000 2006 3100000 2007 700000 2008 700000 2009 24000000 2010 10700000 2011 11400000 2012 6900000 2013 8400000 2014 45400000 2015 100000 2016 4300000 2017 6000000 2018 60500000