Year	constant 2015 US$
1960	19087.682252448103
1961	20119.39557307048
1962	21150.96241147519
1963	22260.56836760705
1964	23508.958832601566
1965	24873.114999058238
1966	25968.91047723225
1967	27224.725444363816
1968	28222.51408493358
1969	29459.5536493074
1970	26804.595919398827
1971	26456.892465228953
1972	24891.09246372937
1973	26168.599673793942
1974	21321.177315457935
1975	17794.804408209937
1976	18334.694511262627
1977	19591.349471420875
1978	21903.021459260923
1979	27073.046095445825
1980	28274.090946437398
1981	25192.08332320105
1982	26391.00016905013
1983	26830.78626700092
1984	30051.2631473717
1985	30891.61840219544
1986	30836.247476955155
1987	31158.496612960553
1988	31286.506688867747
1989	32757.242836412286
1990	31616.77035789745
1991	29704.333139555114
1992	27968.693828029744
1993	27452.04610902709
1994	27754.67926687413
1995	28432.5681444605
1996	29110.694413905472
1997	28987.631992687042
1998	29851.856870498
1999	31497.75429631003
2000	32325.792211500986
2001	32710.503480163014
2002	33155.15203382206
2003	32301.727215306702
2004	32149.93406474907
2005	32791.13127407819
2006	33153.0893732904
2007	33162.16157660349
2008	31933.65482822605
2009	30162.80494953636
2010	30199.018786997993
2011	30008.1161367305
2012	30575.161320968054
2013	29423.30362280475
2014	29698.75831703627
2015	29722.406842934884
2016	29192.74645300182
2017	29781.065814051963
2018	30344.79960012499
2019	29736.79422414192
2020	23256.11606416502
2021	26743.874030304774
2022	29477.235853272065
2023	30061.654651319983