Year	current US$
1970	2267.450039832439
1971	2534.270486506253
1972	2881.7077382367975
1973	3246.470747077042
1974	3456.50728022862
1975	4064.554993062331
1976	3891.152906131022
1977	4308.658951144235
1978	5473.196929265813
1979	6967.861661784334
1980	8807.363458651009
1981	8319.677751848078
1982	7969.242662703838
1983	7601.090534277744
1984	7145.860908446201
1985	7476.58920370747
1986	9409.889738615224
1987	11526.690504635906
1988	14080.336635694493
1989	14122.779272029935
1990	16398.08194420495
1991	17154.96194289921
1992	17960.75283789092
1993	16162.179534613237
1994	17726.879047972856
1995	19281.295869874077
1996	20267.47456519192
1997	22819.647257644665
1998	24813.523591514415
1999	24834.767237856533
2000	24401.02043315726
2001	24062.701850480804
2002	26117.410793851603
2003	29959.883518764895
2004	35034.76125356103
2005	36605.041787584996
2006	37973.61519314781
2007	42710.9708799221
2008	39510.51714662766
2009	32299.43394017127
2010	33571.199311961114
2011	35752.95819658131
2012	35519.33019401599
2013	36085.94595411855
2014	39539.11649638563
2015	37441.0284183644
2016	34104.35681424501
2017	34065.891026246005
2018	36072.66320837174