Year	current US$
1977	511847278.657773
1978	1151532383.53652
1979	3193614422.08245
1980	4078016051.7231
1981	4047765276.99439
1982	4342791242.429
1983	2501759013.91338
1984	2601585745.35044
1985	2815625572.67028
1986	1172005310.63123
1987	1824246968.76754
1988	933774384.924989
1989	1946046244.30449
1990	1361478894.01654
1991	2213097197.6911
1992	2298938382.28754
1993	2394042575.80736
1994	4824343636.08942
1995	5308811206.28842
1996	5319255113.57556
1997	6733704722.04714
1998	5568648476.15874
1999	5057325996.82029
2000	4734276692.27601
2001	4398681886.49697
2002	5222095335.49449
2003	5901761804.7254
2004	7880407174.92946
2005	11076704969.8123
2006	16779311909.582
2007	20472713945.3851
2008	22472548031.2902
2009	19157837017.8823
2010	26553688557.1785
2011	33077446603.9216
2012	34320850952.9507
2013	32965079397.5563
2014	28422180858.313
2015	24195211771.2458
2016	22771974124.4554
2017	25070649959.6775
2018	25376601418.3726
2019	26270555148.5749
2020	20894329917.7965
2021	24956228678.7666