Year	constant 2010 US$
1991	29177.068802844
1992	31193.8210631692
1993	29532.0135082904
1994	28668.513551327
1995	28284.9279768022
1996	28308.2242811702
1997	30120.0995926316
1998	33258.9800659787
1999	38641.8973202061
2000	39107.4543377513
2001	40358.8729297657
2002	45399.4612407109
2003	47695.2277982669
2004	45090.5544974447
2005	44500.6279311167
2006	42249.7610262404
2007	40003.1741565695
2008	53524.3868281865
2009	49756.2787117056
2010	45052.8941539014
2011	49661.1671924441
2012	46891.6722499443
2013	52176.2257097256
2014	48167.149872683
2015	52827.4802269972
2016	49747.1935590386
2017	48994.4689625551
2018	47811.6946623621