Year	current US$
1990	1075458015.26718
1991	1066565656.56566
1992	1085825591.84897
1993	872609500.308452
1994	631207430.340557
1995	525474566.521489
1996	510180201.263749
1997	524882817.938524
1998	529089543.667447
1999	478300517.602332
2000	552270000.865705
2001	596411971.162967
2002	683672597.864769
2003	761976145.828791
2004	1022118673.42079
2005	1194741558.10791
2006	1478954965.31406
2007	1781925678.47673
2008	2090089215.1847
2009	2368448685.63304
2010	2474333986.06494
2011	2835575304.02245
2012	3122488348.17537
2013	3406673181.62781
2014	3699413653.49714
2015	2909130095.74145
2016	2126916185.37332
2017	1530394455.57782
2018	1014861540.26217