Year	constant 2010 US$
1991	5538.57640459115
1992	4829.02154561211
1993	4622.81534334603
1994	4947.25556507479
1995	4467.13788170927
1996	4927.41811384749
1997	5107.60690433031
1998	5403.80578483174
1999	5681.67004958333
2000	5863.249916413
2001	6184.00381492654
2002	6286.85476808119
2003	6458.50299093347
2004	6794.18335384936
2005	7238.75262355247
2006	7710.20124637331
2007	7940.87858687406
2008	8210.4474355452
2009	8206.61593950597
2010	8903.73441336677
2011	9533.37725242557
2012	9411.87422560228
2013	9928.31016533912
2014	10197.3682327715
2015	9997.17639291218
2016	8673.85060663417
2017	9075.23867587156
2018	9438.77865020593