Year	constant 2011 international $
1990	3425.70716921614
1991	3466.03907359711
1992	3561.74007285757
1993	3519.55010135257
1994	3581.81435891403
1995	3628.62044516412
1996	3660.35026210213
1997	3729.73272092784
1998	3839.68806385577
1999	3873.78169544611
2000	3997.97364579698
2001	4032.08410928363
2002	4071.39375335838
2003	4103.52946514501
2004	4145.34544118202
2005	4253.64588810944
2006	4265.41726022596
2007	4284.61200667025
2008	4317.23048624811
2009	4359.81262769584
2010	4566.15739957799
2011	3876.30261880773
2012	3861.11671620834
2013	3938.89106591948
2014	3828.48488681824
2015	3108.76421712747
2016	2619.05068060548
2017	2404.422369654
2018	2284.97050409848