Year	current US$
1987	14352105263.157894
1988	18357500000
1989	20465333333.333332
1990	13362340337.865679
1991	13677622222.222223
1992	12941297376.093296
1993	13099013835.511147
1994	12899156990.615555
1995	13350468917.411453
1996	13948892215.568863
1997	14744603773.584906
1998	14988971210.838272
1999	17078465982.028242
2000	13760513969.314003
2001	11401421329.197435
2002	9687788512.801842
2003	10134453435.46029
2004	12030023547.88069
2005	14307509838.805326
2006	17330833852.918976
2007	22311393927.88172
2008	29549438883.83379
2009	33689223673.257736
2010	49765676402.449455
2011	60178909297.20801
2012	67517349212.06092
2013	73180037914.91043
2014	80845385809.45294
2015	86196264755.31053
2016	86138288644.17099
2017	62081322740.01623
2018	52870108214.67422
2019	60283503705.39067
2020	60224701296.78847
2021	69600614987.35088
2022	81140823252.41638
2023	90889149306.73126