Year	current US$
1999	2712000000
2000	2626000000
2001	2956000000
2002	3835000000
2003	4832000000
2004	5291000000
2005	6185000000
2006	6981000000
2007	8784000000
2008	10543000000
2009	7940000000
2010	7176000000
2011	6842000000
2012	5895000000
2013	6198000000
2014	6412000000
2015	5704000000
2016	6234000000
2017	6616000000
2018	7541000000
2019	8156000000
2020	2334000000