Year current US$ 2011 -635661925.459332 2012 -276575386.170094 2013 1222358341.32377 2014 1565714496.27394 2015 2040299339.17425 2016 3024061816.87285 2017 3292554803.40177 2018 2629246526.3956 2019 3757670855.63547 2020 1649993133.42079 2021 1388625440.52911