Year	constant 2011 international $
1995	3154.07041145101
1996	2974.65375248715
1997	3034.85179344423
1998	2837.45205924553
1999	2746.18812076305
2000	2809.77812336466
2001	2987.84875431816
2002	3228.36854808525
2003	3451.14544225677
2004	3715.7133607431
2005	4004.12234321664
2006	4207.99899486858
2007	4344.29509673129
2008	4692.07275825618
2009	4416.11969752478
2010	4734.38982119657
2011	5012.7420583314
2012	4983.83398812067
2013	5436.02063320425
2014	5711.2824248839
2015	5695.63072457868
2016	5950.35089769523
2017	6234.31034658484
2018	6489.74061429885