Year current US$ 2005 900000000 2006 1050000000 2007 1220000000 2008 1300000000 2009 1100000000 2010 1470000000 2011 1710000000 2012 1856000000 2013 2050000000 2014 2650000000 2015 3595000000 2016 4500000000 2017 5040000000 2018 5910000000 2019 6460000000 2020 4360000000