Year	current US$
2001	9760000000
2002	11362000000
2003	13427000000
2004	16082000000
2005	17963000000
2006	18850000000
2007	22456000000
2008	26401000000
2009	23785000000
2010	30169000000
2011	37343000000
2012	48096000000
2013	59504000000
2014	55383000000
2015	38432000000
2016	27654000000
2017	35584000000
2018	38791000000
2019	40611000000
2020	10800000000