Year	current US$
1987	6561.360874848117
1988	8238.636363636364
1989	8779.631255487271
1990	5050000000
1991	4200000000
1992	3167499999.9999995
1993	3052471169.686985
1994	3491576762.3293395
1995	2744548011.9614573
1996	3259593967.517401
1997	3581801387.2832365
1998	3039729187.367833
1999	2272352072.1238694
2000	2767410068.302555
2001	2558572360.9598956
2002	2642447447.823562
2003	3205648637.9418826
2004	3955185726.2103505
2005	4686885404.167872
2006	6602663509.382269
2007	8098931332.804946
2008	10938548100.606926
2009	9625755842.457918
2010	9755778240.090847
2011	12238589441.41548
2012	13234545722.110052
2013	13241211891.664412
2014	13640173543.482433
2015	11456738649.352983
2016	10940857176.05552
2017	11830102066.432838
2018	12396162556.7173
2019	12150966231.555052
2020	12788257902.691578
2021	15355279393.958212
2022	18274142137.027637
2023	21041376850.06022