Year	current US$
1996	569963969585.81
1997	486520585158.544
1998	381242742236.888
1999	338424847794.386
2000	391301353123.726
2001	286103803300.674
2002	213719525881.366
2003	248919231255.247
2004	310020571983.407
2005	310230290763.337
2006	290943142829.503
2007	301629209750.526
2008	191309552955.928
2009	-35326265756.4236
2010	83797542783.1711
2011	45253802134.895
2012	30324733396.4736
2013	52945354136.8701
2014	70906094926.0576
2015	193940748400.145
2016	259067768971.163
2017	284569305781.229
2018	266039420290.429
2019	261966452391.964
2020	157129877584.269
2021	96194268673.6707