Year	constant 2010 US$
1991	4252.87375447376
1992	4319.80677829478
1993	4306.98160595166
1994	4192.88235614369
1995	4248.41847441265
1996	4242.00500815615
1997	4238.02562530294
1998	4192.75096230956
1999	4239.54164665114
2000	4315.33617789947
2001	4426.88899321812
2002	4912.95706599751
2003	4839.39651427023
2004	5367.85096368637
2005	5684.04106406772
2006	6032.44296512091
2007	6488.80982227892
2008	7045.10315857085
2009	7530.40907813548
2010	8269.36514805311
2011	8356.37149768387
2012	8313.66207977626
2013	8594.89056127667
2014	8903.20620271981
2015	9022.67796392697
2016	8742.55467144878
2017	8381.67035559647
2018	8266.69283335115