Year	current US$
2000	3686000000
2001	4367000000
2002	4350000000
2003	4385000000
2004	5783000000
2005	8277000000
2006	8738000000
2007	10690000000
2008	12083000000
2012	14107000000
2013	13884000000
2014	17492000000
2015	17686000000
2016	19184000000
2017	21856000000
2018	25790000000
2019	28595000000
2020	15777000000