Year current US$ 2011 270000.010728836 2012 223538.29443454702 2013 522820.77074050903 2014 564152.2407531741 2015 601347.9232788091 2016 493950.814008713 2017 505861.22274398804 2018 423046.46968841605 2019 467849.880456924 2020 446996.957063675 2021 403600.00729560904 2022 393406.122922897