Year	constant 2010 US$
1991	2832.02556532808
1992	2876.04613078609
1993	2800.57274917514
1994	2883.61422232116
1995	2916.12955088334
1996	3026.0797618385
1997	3119.92725339256
1998	2862.71491496877
1999	3065.17117182301
2000	3041.97012094969
2001	3150.65305769217
2002	3165.95088289319
2003	3335.70881879592
2004	3134.52460086763
2005	3277.8657090166
2006	3349.8373120107
2007	3581.62183609138
2008	3649.34459714035
2009	3685.52481456944
2010	3759.01607896275
2011	3987.80831157627
2012	3878.21358189005
2013	4288.59618415491
2014	4797.46809503353
2015	4500.95324016509
2016	4237.45649343504
2017	4179.39767689236
2018	4259.45762226077