Year	current US$
1988	556950205.081
1989	780225806.451613
1990	1086625975.869411
1991	1315883909.3378289
1992	1297400000
1993	1442512276.7062843
1994	3387415252.3464575
1995	3762157959.605598
1996	3983815754.8455935
1997	4125265587.790138
1998	4450051332.93643
1999	4659194033.515958
2000	4907694735.265366
2001	5110176766.203755
2002	5017855248.293138
2003	5124050732.889318
2004	5600936707.828225
2005	6171335217.799239
2006	6548088002.2766075
2007	7227921782.25872
2008	8277746607.199087
2009	8048780215.836181
2010	8514391414.283306
2011	9505607733.57474
2012	10116164876.606913
2013	10448739544.064589
2014	11432534071.166344
2015	12267705688.121864
2016	12651915998.742184
2017	13074248315.358276
2018	12373039739.234055
2019	12232645540.53687
2020	11871447910.873241
2021	13248467555.656649
2022	14530734214.927635
2023	16935015693.775177