Year	constant 2010 US$
1977	2944.47474012589
1978	3140.9488710266
1979	3335.66332663549
1980	3301.72602197799
1981	3294.10705109723
1982	3337.32959530559
1983	3354.21197285327
1984	3387.19667420458
1985	3536.97936147456
1986	3782.1680232373
1987	4157.57779642914
1988	4338.34086371354
1989	4557.34809557295
1990	4769.39689123885
1991	4829.01238132332
1992	4753.17066617138
1993	4609.54085406109
1994	4634.66803425752
1995	4689.18509857326
1996	4862.73043799469
1997	5078.16287907923
1998	5649.77067982845
1999	6015.27929001296
2000	6284.69996784302
2001	6132.69475613606
2002	6319.92924986007
2003	6893.36806378174
2004	6826.29001746957
2005	7709.14955177846
2006	7382.16261402016
2007	7815.06520462278
2008	7869.21693735805
2009	7325.6710994073
2010	7257.75662232319
2011	7274.72313572426
2012	7147.18918737909
2013	7266.28734042283
2014	7747.50073076196
2015	8194.2381676678
2016	8449.30776858458
2017	8827.69860430899
2018	9205.65391878438