Year	constant 2011 international $
1990	1017.76413582286
1991	975.558188841629
1992	1272.15906032615
1993	1365.58848226355
1994	1538.47595715551
1995	1743.20535684194
1996	2796.3984590553
1997	6721.72450099936
1998	7991.57198386821
1999	9640.70475511417
2000	10937.6970387747
2001	17149.0185031478
2002	19655.3288982911
2003	21475.8144936453
2004	28384.4667288757
2005	31697.8014713925
2006	32618.6405999545
2007	35901.4596958074
2008	40368.0796343763
2009	39060.9130342086
2010	33990.1467708637
2011	34622.1162657965
2012	35887.8163024139
2013	32959.1080995665
2014	31743.4107479562
2015	27708.638181831
2016	24296.6035798435
2017	22298.9421444051
2018	20864.5819081271