Year current US$ 2011 -6232494.13001442 2012 3774975513.83849 2013 5907804740.14754 2014 19674857066.2358 2015 22602624760.5269 2016 26404059369.9385 2017 36309887974.6382 2018 6812763852.66046 2019 7280718070.32914 2020 4560530372.035 2021 -2803121070.10333