Year	constant 2015 US$
1960	2394.8374483858215
1961	2032.5651593681919
1962	1607.5542883705484
1963	2124.6772128475955
1964	2210.0365344298757
1965	2308.8867735802714
1966	2157.495111324045
1967	2309.4925135560047
1968	2501.8268585790893
1969	2652.479808485207
1970	2823.742980810885
1971	2447.984183864635
1972	3048.1439879791888
1973	3090.1751395792385
1974	3241.3029642641973
1975	3281.1807356274953
1976	3389.151596319604
1977	3435.4404365075034
1978	3645.945942414381
1979	3803.3281911356144
1980	3716.3058881171896
1981	3706.742421268188
1982	3816.0442125013483
1983	3889.477260347816
1984	3970.704379443078
1985	3980.0665168700325
1986	3865.0755766359553
1987	3723.5361343589793
1988	3586.4122827700803
1989	3646.9609276041924
1990	3585.5852028350564
1991	3459.0797380410368
1992	3440.459383366625
1993	3293.5883926975184
1994	3195.8704507545826
1995	3254.292144340304
1996	3328.5053659084974
1997	3309.018787051425
1998	3425.639262713342
1999	3486.1657427522755
2000	3568.2503135299157
2001	3625.0745789591174
2002	3769.6367430890973
2003	3960.661482100604
2004	4081.053661803955
2005	4243.153895500507
2006	4303.733577895439
2007	4365.501344096732
2008	4398.818288256288
2009	4372.37117773506
2010	4497.861364831998
2011	4545.677997997785
2012	4565.20032665602
2013	4592.676569931881
2014	4687.288575352803
2015	4741.499770335584
2016	4829.185829490818
2017	4806.631254793115
2018	4782.034706797631
2019	4737.129773699712
2020	4422.9794718831445
2021	4515.573999183472
2022	4602.575608477859
2023	4717.399328784285