Year	current US$
1995	18104258324.147038
1996	20190495048.356636
1997	22181465510.313595
1998	23516932183.81298
1999	24370717865.118694
2000	26836449654.700962
2001	26055343130.341568
2002	25516146462.40691
2003	28533704751.78537
2004	32413790702.287163
2005	36994042538.593796
2006	40495552696.32215
2007	44838428812.676285
2008	48596472018.825615
2009	44191553377.885185
2010	46739962747.30323
2011	50467276355.720604
2012	54141976261.4906
2013	58224976108.71836
2014	64132465411.39319
2015	66701100396.33176
2016	71234508365.48373
2017	75265640563.8095
2018	79006050569.6583
2019	81459149602.49179