Year current US$ 2006 750000 2007 600000.023841858 2008 300000.011920929 2009 270000.010728836 2010 349999.99403953605 2011 1129999.99523163 2012 430000.00715255697 2013 699999.988079071 2014 379999.99523162795 2015 274509.161710739 2016 789473.176002502 2017 153545.260429382 2018 1315015.91205597 2019 175796.508789063 2020 341241.002082825 2021 207621.529698372 2022 272982.805967331