Year	constant 2010 US$
1970	8322.69970591215
1971	8642.41982810764
1972	9256.96205482829
1973	9869.33172039341
1974	10259.9303308743
1975	10332.3012889004
1976	10796.2080103863
1977	10845.9458260837
1978	10838.7297121858
1979	10883.2403971204
1980	11019.2244621334
1981	10831.8548787215
1982	10771.3335605098
1983	10760.6642908738
1984	10694.7359809489
1985	10899.3737954935
1986	11236.629301934
1987	11874.6307812416
1988	12429.0772013113
1989	13083.0305843925
1990	13528.5274755382
1991	13883.6804652599
1992	14116.1392787924
1993	13775.94006596
1994	13859.194048402
1995	14034.6006303447
1996	14319.7409749722
1997	14667.7170661959
1998	15256.4206697077
1999	15937.1186649453
2000	16589.4774576324
2001	17088.5667827021
2002	17354.1668634133
2003	17449.2538208643
2004	17842.1905399484
2005	18245.0630796154
2006	18620.5336482495
2007	18875.5686076304
2008	18455.4378475008
2009	17631.3514791168
2010	17594.4364529165
2011	17119.3376418767
2012	16506.511976589
2013	16045.2646416153
2014	16339.7766672278
2015	16850.492737374
2016	17316.5174121695
2017	17711.2910442039
2018	18067.0505595376