Year	current US$
1977	4444444.656
1978	7149758.339
1979	8695652.008
1980	12222222.33
1981	10483091.35
1982	10193236.35
1983	11014492.99
1984	11497584.34
1985	14202898.98
1986	13574879.65
1987	8550724.983
1988	11304347.99
1989	6473430.157
1990	5217391.491
1991	9758454.323
1992	15019130.71
1993	18379999.16
1994	24625669.48
1995	27359669.4433314
1996	16012210.3622882
1997	9232460.37342668
1998	27313236.4706561
1999	33729646.6109497
2000	53158882.3789732
2001	18313718.1709493
2002	32986894.4223657
2003	46470192.4649014
2004	133742806.235814
2005	173519405.683879
2006	172153313.961754
2007	357838224.989752
2008	386696265.842837
2009	261601951.495537
2010	436143876.305004
2011	538339894.672104
2012	624360669.898232
2013	833031317.03511
2014	1796377786.73295
2015	1086986751.24654
2016	772235946.595019
2017	393379170.003451
2018	436325463.090782
2019	479624165.264604
2020	404088319.891243
2021	447647084.052728
2022	510201215.39532
2023	591953735.351563