Year	current US$
1995	3969000000
1996	4477000000
1997	3741000000
1998	2381000000
1999	3588000000
2000	5011000000
2001	6863000000
2002	7118000000
2003	5901000000
2004	8203000000
2005	8846000000
2006	10427000000
2007	14050000000
2008	15293000000
2009	15798000000
2010	18152000000
2011	19649000000
2012	20251000000
2013	21500000000
2014	22600000000
2015	17666000000
2016	18085000000
2017	18385000000
2018	19608000000
2019	19828000000
2020	3004000000