Year	current US$
1994	2171800000
1995	2137720000
1996	6051200000
1997	8508100000
1998	11445600000
1999	2869900000
2000	4488000000
2001	1644500000
2002	697700000
2003	808000000
2004	1092600000
2005	3448900000
2006	6286390000
2007	12669600000
2008	13291380000
2009	12598860000
2010	7459500000
2012	25574940000
2013	19045900000
2014	39445840000
2015	14783700000
2016	8453240000
2018	4087500000
2020	2357860000
2022	14001160000