Year	current US$
2004	6486000000
2005	4626000000
2006	4769000000
2007	5971000000
2008	5910000000
2009	5995000000
2010	6712000000
2011	8459000000
2012	7432000000
2013	7651000000
2014	8238000000
2015	10130000000
2016	11096000000
2017	12056000000
2018	13790000000
2019	16431000000
2020	4036000000