Year	constant 2010 US$
1968	1454.58600359962
1969	1450.87426704582
1970	1465.97049762468
1971	1493.86957289718
1972	1499.40390774615
1973	1515.44470607219
1974	1703.45189522242
1975	1855.13128070697
1976	2104.57225896738
1977	2076.86041020543
1978	2355.75875845994
1979	2761.82477534583
1980	3345.99102631639
1981	3229.18755466833
1982	3250.20185065901
1983	2752.22021046526
1984	2644.45602823193
1985	2619.88206152247
1986	2680.64710088407
1987	2867.49189293871
1988	2805.63679964615
1989	2656.94549091326
1990	4091.02857629177
1991	1432.17203666133
1992	1845.98450165112
1993	2335.04463252421
1994	2352.53710758242
1995	2329.68116509142
1996	2507.56275601946
1997	2947.02590882523
1998	3853.01089226578
1999	4393.81302226348
2000	4323.72623508853
2001	4293.5594571164
2002	3881.26013962643
2003	2524.38111249936
2004	3792.54179752013
2005	3869.95342447494
2006	4181.40081811838
2007	4168.66704409654
2008	4436.25206984141
2009	4493.18412633592
2010	4657.28042580536
2011	4848.44239867785
2012	5322.38530653205
2013	5508.04357882812
2014	5344.3319642002
2015	5298.10391212163
2016	5846.51174634922
2017	5604.57005725823
2018	5510.75889523688