Year current US$ 2005 660000000 2006 414000000 2007 502000000 2008 613000000 2009 574000000 2010 716000000 2011 595000000 2012 598000000 2013 531000000 2014 679000000 2015 762000000 2016 556000000 2017 632000000 2018 542000000 2019 670000000 2020 272000000