Year	current US$
1990	120084968.8037161
1991	127008314.18501142
1992	141536044.35132644
1993	132323028.63086745
1994	140084556.1533527
1995	153017813.39180163
1996	142974784.26026306
1997	130180897.92327876
1998	201721915.27703837
1999	205935302.4590818
2000	177436051.24906194
2001	179289285.8753565
2002	202695913.28192666
2003	260518185.79131502
2004	307820086.5669877
2005	325103031.11141574
2006	378451954.2533775
2007	438829157.5597537
2008	480808048.3897663
2009	507855804.62412006
2010	520236116.1847624
2011	564484461.5541675
2012	530660873.15225166
2013	603504358.6592847
2014	598579438.4116509
2015	512481103.07868564
2016	515542542.31940216
2017	514071927.35593677