Year	current US$
1981	2406230000
1985	5945830000
1988	17752540000
2000	411243070000
2001	360388820000
2002	264752150000
2003	406733140000
2004	561974470000
2005	837515900000
2006	1207938400000
2007	1998030310000
2008	993369120000
2009	1948688990000
2010	2380999160000
2011	1970886850000
2012	2151476410000
2013	1888535610000
2014	1615355450000
2015	1099686180000
2016	1367264009951.5283
2017	1713586510000
2018	1559553860000
2019	1889364090000
2020	1627251130000
2021	1500098730000
2022	1456748990000