Year	current US$
1984	62000000
1986	4000000000
1989	542600000
1992	2213000000
1993	4643800000
1994	5664100000
1995	6714470000
1996	9751700000
1997	11961500000
1998	4986800000
1999	4335500000
2000	2312300000
2001	3178030000
2002	3126170000
2003	7455890000
2004	1060690000
2005	6229120000
2006	3678280000
2007	2729330000
2008	6991870000
2009	4641600000
2010	11547181000
2011	8235670000
2012	16845750000
2013	9993320000
2014	11224420000
2015	12615915000
2016	14717371000
2017	20020140000
2018	9646910000
2019	5582130000
2020	3939500000
2021	7717220000
2022	4860910000