Year	constant 2011 international $
1990	8366.63218540654
1991	8262.17850987819
1992	7452.92486020855
1993	6871.03319279074
1994	6074.24098779921
1995	5460.13841164859
1996	5631.80627795077
1997	6300.49799152434
1998	6862.29737993061
1999	7125.52295663578
2000	7574.4049979219
2001	7973.1135065485
2002	8428.86324527166
2003	9085.88621617333
2004	10195.5108209511
2005	11230.3314313225
2006	12429.2352111868
2007	13560.2284948669
2008	14995.0776294825
2009	15058.6044544366
2010	16260.5926799472
2011	17166.6956434719
2012	17472.3249308517
2013	17644.8544069875
2014	17933.3427177555
2015	17219.1206477761
2016	16763.0361063249
2017	17193.4241428478
2018	17741.8622306394