Year current US$ 2008 279153358 2009 233457655 2010 268284615 2011 324875699 2012 316859341 2013 354220539 2014 264492175.99999997 2015 266537590.00000003 2016 311291838 2017 360255508 2018 374563535 2019 396193875 2020 309393322 2021 318589665 2022 329499960