Year	current US$
1990	-4208814508.06666
1991	-1528395173.9763
1992	-1827899065.43952
1993	-1698231756.38861
1994	-1829395643.63852
1995	-3909583025.14879
1996	-5437665155.85196
1997	-4537732421.12161
1998	-5159867297.48867
1999	-4459707996.59681
2000	-3082602855.98522
2001	-2840455021.68038
2002	-3091789273.77538
2003	-4129983597.58067
2004	-3611430132.79727
2005	-4392000910.04874
2006	-30655349.3925151
2007	2137859511.85878
2008	16053308482.1357
2009	12837268898.9541
2010	8376247552.61006
2011	8116977039.69204
2012	5720824909.53989
2013	11767236670.2347
2014	13722099853.1059
2015	13217512851.5116
2016	9067976254.82364
2017	9311673540.23355
2018	6364729456.8321
2019	10251743041.8918
2020	14939820160.9626
2021	13828432029.5413