Year	constant 2021 US$
1970	4354419969.558716
1971	3936889982.2235107
1972	3950180019.3786626
1973	9275120111.465458
1974	13709199743.270878
1975	18339949721.33637
1976	17859559484.48182
1977	19326180465.698254
1978	17516780183.792118
1979	16708060386.657715
1980	17731760259.628304
1981	17380360012.054443
1982	14058429813.385027
1983	11411270094.871529
1984	11203199740.529058
1985	11861519879.341137
1986	9128239986.419685
1987	9017440158.843996
1988	6450620025.634771
1989	6458630031.585697
1990	17093009848.594666
1991	15468169715.88135
1992	9687240119.457243
1993	7620090064.048767
1994	7970420114.040375
1995	5921709951.877596
1996	6507130001.068115
1997	6469809871.67359
1998	6684070055.961609
1999	6035669894.21845
2000	5561730136.871338
2001	5898149968.147282
2002	5024410051.345831
2003	9032379990.577705
2004	11070220234.870909
2005	30963689792.63306
2006	15671730060.57739
2007	15543980167.38892
2008	16464770500.183107
2009	8379689895.629883
2010	7207649977.684031
2011	7809159919.738765
2012	9693130020.141611
2013	15744989990.234386
2014	16058960166.931158
2015	16623559562.683123
2016	22984260253.90626
2017	24600949554.443363
2018	28253610122.680683
2019	24221039688.110367
2020	24845969726.562508
2021	28951530029.296894