Year	current US$
1989	3181900000
1994	2071800000
1995	2137720000
1996	5771200000
1997	8410300000
1998	11445600000
1999	2869900000
2000	4386400000
2001	1629500000
2002	660100000
2003	608000000
2004	1058600000
2005	3262900000
2006	6286390000
2007	12439600000
2008	13291380000
2009	11893860000
2010	7390500000
2011	10635100000
2012	25574940000
2013	18425900000
2014	39382040000
2015	14758200000
2016	8434340000
2017	2340100000
2018	4087500000
2019	8496010000
2020	2357860000
2021	8158650000
2022	13340340000