Year	constant 2010 US$
1970	8570.42324739629
1971	8910.43896983797
1972	9310.27927100187
1973	9739.36419604471
1974	9839.68864172213
1975	9979.06963194669
1976	10347.8885624658
1977	10577.3601688141
1978	10876.4139114719
1979	11242.2580533683
1980	11390.7597606301
1981	11399.9425999034
1982	11465.7268372488
1983	11588.6320381604
1984	11738.3242168845
1985	11993.8617214485
1986	12444.3055038599
1987	12883.9058500637
1988	13364.4394280719
1989	13784.8438531532
1990	14114.9167385551
1991	14270.9605060423
1992	14502.5416075617
1993	14475.3718787175
1994	14747.3147870556
1995	15003.6311573109
1996	15344.0001272806
1997	15699.4538946659
1998	16190.3574037964
1999	16725.0170619365
2000	17244.1691339887
2001	17605.4388261353
2002	17856.2296294928
2003	18097.1426064483
2004	18440.3481826476
2005	18777.6086166827
2006	19121.0763078258
2007	19482.1587251744
2008	19503.8873402742
2009	19175.1231610116
2010	19286.5527373987
2011	19305.9727354067
2012	19154.4602798537
2013	19081.5356556225
2014	19256.0080913028
2015	19599.8301824066
2016	19998.677355898
2017	20380.224280751
2018	20671.1443236753