Year	current US$
2001	4726000000
2002	5278000000
2003	5879000000
2004	7262000000
2005	7805000000
2006	9720000000
2007	12426000000
2008	15821000000
2009	12369000000
2010	13239000000
2011	16961000000
2012	17876000000
2013	20198000000
2014	19451000000
2015	13186000000
2016	12822000000
2017	14938000000
2018	18735000000
2019	17235000000
2020	4961000000