Year	current US$
1995	15364291737.821032
1996	17825935202.415024
1997	18773028548.37083
1998	19681852920.40755
1999	17773121557.550694
2000	19844000000.000004
2001	19116000000.000004
2002	16962000000.000006
2003	17415000000.000004
2004	19754000000.000004
2005	23167000000.000004
2006	25642000000.000004
2007	30400000000
2008	34858000000
2009	33295000000
2010	39977000000
2011	47970100000.38147
2012	51755699999.809265
2013	57298100000.38147
2014	59110000000
2015	52244000000
2016	52935000000
2017	60724644680.476494
2018	60774345989.085144
2019	57099555586.53064