Year	current US$
2007	19947348000
2008	21676178000
2009	18119039000
2010	20245774000
2011	22847603000
2012	17575520051
2013	17133941127
2014	15681722657
2015	14668165090
2016	15878515224
2017	16896040559
2018	18039318661
2019	18426664252
2020	18155662306
2021	19657869162
2022	21996652567