Year	current US$
1972	3736310590.126423
1973	4542247368.190514
1974	5656630536.8071995
1975	6385143645.927785
1976	6719069798.767337
1977	6532787706.317395
1978	7486519832.396322
1979	8379048196.088321
1980	9625044436.82747
1981	9849903407.105963
1982	10138771633.02577
1983	10927345486.479973
1984	13476983113.211565
1985	17445442929.58065
1986	6582268541.53978
1987	4304799423.22966
1988	3555866510.732295
1989	3605132688.2284184
1990	3843326203.178579
1991	4064380719.559325
1992	4561615475.420596
1993	4973025737.212245
1994	5146399388.113275
1995	5387239944.128853
1996	5643859118.952454
1997	5722702884.5983515
1998	5440019145.166419
1999	5275750588.767359
2000	4886328865.230539
2001	4500471123.975926
2002	4374250092.558167
2003	4430883374.468823
2004	4978502968.011251
2005	4915137015.286463
2006	4765853072.206768
2007	5150083862.023594
2008	6048720442.061473
2009	6707597751.54921
2010	7036997870.91539
2011	7089756811.902635
2012	7465884816.551229
2013	7611229376.892979
2014	8305213731.229789
2015	8703469637.150927
2016	9099739319.850708
2017	9948322342.213247
2018	10687798811.764565
2019	12161401431.85001
2020	12532996086.788208
2021	13412479878.212217
2022	16302673123.485624
2023	19271126574.16087