Year	current US$
1989	2177700000
1990	4603400000
1991	395500000
1992	1921800000
1993	427800000
1994	235200000
1995	324320000
1996	74100000
1997	3139800000
1998	795800000
1999	370200000
2000	793600000
2001	223800000
2002	71400000
2003	74700000
2004	485600000
2005	1321300000
2006	2744430000
2007	6146400000
2008	905080000
2009	1738540000
2010	1099400000
2011	2729100000
2012	1593240000
2013	3740500000
2014	629400000
2015	787100000
2016	422700000
2017	1006900000
2018	589360000
2019	260000000
2020	137700000
2021	655400000
2022	228000000