Year	constant 2015 US$
1960	8863.337404239839
1961	9592.51212112443
1962	10369.048726478977
1963	10872.908187457739
1964	11399.323380592836
1965	12310.966692383705
1966	12817.8941063674
1967	13420.82653031303
1968	13872.54082803368
1969	14105.466457129369
1970	20602.596218893428
1971	23701.19829947339
1972	27716.534563047393
1973	32646.156952139598
1974	35942.44763668434
1975	31017.212306284997
1976	34691.037754711615
1977	35303.10950330766
1978	31806.218239955266
1979	33864.004452437344
1980	34055.66226911195
1981	33070.587442775635
1982	24991.202380488863
1983	20006.569759645616
1984	18199.566370338638
1985	15678.471660713165
1986	17538.828640063915
1987	15670.730681397286
1988	16973.44608045923
1989	16184.616679262377
1990	17884.664929035487
1991	19766.60037002254
1992	19808.935076261212
1993	18920.100013849988
1994	18486.074133205402
1995	18013.980978192874
1996	17992.407248226984
1997	17709.185753675323
1998	17746.107633533284
1999	16641.696461460873
2000	17139.19299224799
2001	16518.81893825494
2002	15671.733789484957
2003	17036.38230588698
2004	17995.049364048573
2005	18425.07951849235
2006	18203.741782018475
2007	17825.64129849027
2008	18223.67360378422
2009	17192.681621592517
2010	17489.22926856084
2011	18936.155955401504
2012	19526.10952237146
2013	19600.723841663297
2014	19940.48314120995
2015	20442.362562008428
2016	20412.231797220422
2017	20130.215598074734
2018	20284.795680432
2019	20044.268607688995
2020	19235.242268120288
2021	20237.713144629575
2022	21478.816533712095
2023	21006.15117266286