Year	constant 2015 US$
1970	4257.108672791645
1971	4487.989476541739
1972	4678.483727411687
1973	4951.757775390003
1974	5158.729647037753
1975	5212.126131907756
1976	5338.632755527968
1977	5467.136115646293
1978	5557.47041485763
1979	5833.92199492425
1980	6072.731644508499
1981	5970.084853522142
1982	5723.247058059796
1983	5469.446644360657
1984	5574.555097850773
1985	5658.2784304212955
1986	5755.196875337167
1987	5865.917303662178
1988	5795.781404358587
1989	5986.513118407242
1990	5691.436360728113
1991	5789.129938593165
1992	5847.846513673276
1993	6003.128630726631
1994	6176.446845063809
1995	6156.994020434441
1996	6302.629712384615
1997	6540.216045029331
1998	6611.085930852175
1999	6526.853089402943
2000	6661.125809809411
2001	6584.416161979332
2002	6507.776562925287
2003	6576.017411150758
2004	6787.98280685741
2005	6960.93370085458
2006	7296.499179913116
2007	7607.212652977453
2008	7805.406338491522
2009	7543.864289547644
2010	7919.356608558459
2011	8176.200672850394
2012	8304.16893275578
2013	8475.059644842038
2014	8496.270802952642
2015	8464.865874649977
2016	8334.054415205339
2017	8400.15338022712
2018	8412.718545773647
2019	8395.690973033812
2020	7819.021969380211
2021	8265.955998001658
2022	8546.450388674986
2023	8661.801330975131