Year	constant 2015 US$
1960	3169.8719360007863
1961	2931.522958302723
1962	3094.823232470573
1963	3322.9426046294657
1964	3432.5604552847813
1965	3311.931049584202
1966	3679.300507898623
1967	3608.075149717567
1968	3787.7870859032723
1969	3698.743528130964
1970	3934.1074591994443
1971	4466.487021099192
1972	4635.195300730627
1973	4978.196660938508
1974	4952.094337136635
1975	4992.676352375196
1976	5689.075064317276
1977	5226.172704101583
1978	6294.513802006649
1979	7226.368411673418
1980	6795.4421341611915
1981	6453.04441299185
1982	6282.312433796338
1983	6251.168373145625
1984	6481.83312264823
1985	7091.310697331207
1986	7100.937353617846
1987	7137.556036213683
1988	7489.74029934459
1989	8210.90696994188
1990	8779.85231314913
1991	8902.837987762658
1992	9497.755410708398
1993	9981.244603515805
1994	9481.880526577695
1995	9388.819677207426
1996	10177.090467169593
1997	11284.845976659804
1998	11339.348129704647
1999	11326.938608306265
2000	11703.753524611737
2001	11427.941308301515
2002	11218.260646431501
2003	10677.96920812724
2004	10412.086893602744
2005	11297.311819049313
2006	12105.44752655577
2007	13112.821009881634
2008	12473.292176912148
2009	12116.37836879766
2010	12313.556691924936
2011	13843.711608187765
2012	14135.001057065338
2013	14050.313558131418
2014	14395.615811877102
2015	15333.105172710513
2016	16962.675397273124
2017	17921.57319769184
2018	18628.186227669597
2019	19481.64610537415
2020	17048.36172978795
2021	17005.04220636792
2022	16188.781327560499
2023	16715.26509238888