Year	constant 2015 US$
1960	4061.119756159604
1961	4251.532200820478
1962	4500.155989672075
1963	4745.292667641855
1964	5041.9588445596455
1965	5440.683383908664
1966	5705.413379923683
1967	6174.9007437269875
1968	6751.7662595907905
1969	6957.107257873933
1970	7658.744289578126
1971	8201.296280922817
1972	8872.365679848801
1973	9863.078914099195
1974	9837.61577783563
1975	9059.007114498483
1976	9412.55413328769
1977	9834.92253552141
1978	10003.354408464178
1979	10454.760115866928
1980	10816.951805302038
1981	10897.084021959827
1982	11061.945286556967
1983	10991.679521277318
1984	10743.643691008006
1985	11015.09312282201
1986	11460.794481914269
1987	12195.438620537727
1988	13122.402136450111
1989	13987.965137403879
1990	14572.288380074284
1991	15243.930042050844
1992	15421.9948914487
1993	15088.41396310349
1994	15193.054738018242
1995	15788.983105781952
1996	16280.93715183532
1997	16921.72194368091
1998	17645.90582694506
1999	18231.839763745415
2000	18795.031147983413
2001	19025.695690538792
2002	19067.655433211796
2003	18819.443737639314
2004	19110.32084316323
2005	19224.034651331363
2006	19501.23300701025
2007	19950.844096619894
2008	19985.698331971147
2009	19343.280049908793
2010	19670.361068633294
2011	19365.18164886808
2012	18654.9575281944
2013	18584.55404517028
2014	18833.05182816915
2015	19250.106537685195
2016	19700.910001677457
2017	20441.485804108353
2018	21057.617478423217
2019	21617.411624379016
2020	19802.228913466268
2021	20807.52768134163
2022	22125.939194710907
2023	22377.666123787174