Year current US$ 2011 -632514699.23175 2012 -273859822.573932 2013 1225044286.5091 2014 1568655470.81904 2015 2043020613.8162 2016 3027190602.2193 2017 3296170774.48476 2018 2633048491.98796 2019 3761241087.36153 2020 1653395331.74087 2021 1392524461.08391