Year	current US$
1987	8100.445524503848
1988	10132.575757575758
1989	10438.006048190422
1990	5800000000
1991	4800000000
1992	3517499999.9999995
1993	3210823723.2289953
1994	3738720813.597102
1995	3038354856.5732636
1996	3497869829.5863667
1997	3938811021.194605
1998	3440217884.8006606
1999	2570075380.9427137
2000	3028480293.4480143
2001	2869097696.738618
2002	2974865496.9428535
2003	3529699624.822315
2004	4541266694.490818
2005	5609003268.649923
2006	7532718164.6262455
2007	9777119555.19691
2008	13420785730.001236
2009	11620084442.441036
2010	11905938927.54589
2011	14642679521.729979
2012	15615077171.465635
2013	15806167974.268793
2014	16337903749.687794
2015	13680883181.115936
2016	13286230761.91784
2017	14118422445.211117
2018	14775176760.702309
2019	14469399262.202044
2020	15127681223.269125
2021	18018594802.6949
2022	21404554420.135796
2023	24916278322.878437