Year current US$ 2005 290000000 2006 65000000 2007 126000000 2008 145000000 2009 118000000 2010 115000000 2011 68000000 2012 69000000 2013 60000000 2014 71000000 2015 77000000 2016 82000000 2017 52000000 2018 44000000 2019 32000000 2020 38000000