Year current US$ 2011 74873365088.7399 2012 83713532912.8564 2013 84881616601.8726 2014 82652129324.2096 2015 46818708496.8549 2016 39754437422.9721 2017 48002505122.9448 2018 60574842053.7349 2019 49625268486.3156 2020 34653801285.3508 2021 60424513913.155