Year	constant 2010 US$
1991	23585.2800098955
1992	23730.0267121595
1993	24322.7351484753
1994	25184.9133240406
1995	26226.1782274959
1996	26986.9307387542
1997	27501.636746236
1998	27368.0912348148
1999	28664.1382190344
2000	29440.3287823106
2001	29729.8530598657
2002	30898.1282810633
2003	31510.5610617686
2004	31380.9102212096
2005	32002.8028128472
2006	32688.3578760884
2007	33539.6289478663
2008	34100.9212316547
2009	34157.9143794606
2010	35290.9456257866
2011	35486.1518778678
2012	35586.1127812031
2013	35997.7277836729
2014	36239.2890939302
2015	36805.8961128397
2016	37084.4202970863
2017	37441.9369283945
2018	38189.3037290545