Year	current US$
1988	173146191.41
1989	271064516.12903225
1990	214052519.51738822
1991	351269083.0757703
1992	375140000
1993	372304462.3158494
1994	676975189.2784364
1995	782132699.851569
1996	955398079.5447811
1997	1153928800.4995713
1998	1197054120.7155616
1999	1602612153.1335473
2000	1361946958.4686701
2001	1300849520.2626402
2002	1171804873.9413247
2003	1184226268.8187704
2004	1396738316.642823
2005	1636291233.6478758
2006	1910870802.5042686
2007	2323820364.7993064
2008	2855114882.8973927
2009	1925366896.9247031
2010	2175647581.0529866
2011	3028366548.788591
2012	3266147697.97891
2013	3394235280.7934375
2014	3430962020.732774
2015	4270530656.5701036
2016	4145312882.149471
2017	4124102772.2963376
2018	3135751682.872102
2019	2264376526.5671754
2020	2462313021.044141
2021	3293167666.543459
2022	3408753874.629262
2023	4105545371.7221165