Year current US$ 2011 23740000.24795532 2012 15708121.895790108 2013 22714256.4058304 2014 25510009.05036926 2015 27597494.602203377 2016 29917753.33881379 2017 25186822.41439818 2018 23541149.616241448 2019 34997652.53067016 2020 23155210.494995132 2021 33696300.02975463 2022 26202618.837356582