Year	current US$
2006	553885863
2007	623209199
2008	612077146
2009	386369473
2010	436526927
2011	629697999
2012	470629109
2013	495144978
2014	438136999
2015	351763674
2016	360533091
2017	419286380
2018	467806604
2019	462953921
2020	413623797