Year	current US$
1991	591902823.729503
1992	801144127.668524
1993	688219166.474924
1994	925657067.63825
1995	1003118011.57657
1996	887025699.352851
1997	827731792.876464
1998	799625775.219072
1999	634148678.454253
2000	787335006.465382
2001	500645733.339749
2002	608673670.707073
2003	867147799.866127
2004	1494491285.87887
2005	1623902248.2765
2006	2180631637.46054
2007	1666599961.50683
2008	1676788202.83611
2009	845061375.524141
2010	1355957911.1715
2011	989516284.665519
2012	1208318080.1676
2013	1671982043.60756
2014	2177146499.94918
2015	1190849986.83349
2016	-68510772.9369076
2017	881871208.013177
2018	902652101.86897
2019	926482993.168393
2020	1135286845.2124
2021	-221468322.390147