Year	constant 2010 US$
1991	2483.66460145812
1992	2545.63958962789
1993	2654.73189184073
1994	2709.98234275766
1995	2912.55410238639
1996	3053.56182174573
1997	3261.43043477099
1998	3438.28876160771
1999	3728.21799730559
2000	3822.38723407491
2001	3945.08896855134
2002	4118.83800301209
2003	4288.82155706213
2004	4515.56743856166
2005	4751.20017205256
2006	4993.32373502448
2007	5288.78314044344
2008	5547.07940609168
2009	5938.91094871052
2010	6303.06024313392
2011	6437.57525905277
2012	6700.08497312192
2013	6989.19165412516
2014	7402.06353355405
2015	7816.71334085882
2016	8200.582864663
2017	8596.2098512124
2018	8974.6673818133