Year	current US$
2005	11913977402.642366
2006	16520580616.610853
2007	21728749775.01895
2008	28474948949.773964
2009	25145716720.93502
2010	30184026133.643646
2011	33356316266.567547
2012	35197645793.33689
2013	39455617134.6857
2014	39098359294.58508
2015	39433201556.382614
2016	32650144143.221653
2017	40237943893.08136
2018	47653655921.18158