Year current US$ 2005 0 2006 0 2007 0 2008 0 2009 0 2010 0 2011 573626373.626374 2012 803296703.296703 2013 574395604.395604 2014 498626373.626374 2015 437087912.087912 2016 378571428.571429 2017 665934065.934066 2018 467032967.032967 2019 576648351.648352 2020 651648351.648352 2021 858791208.791209 2022 1031593406.59341 2023 1199900756.83594