Year	current US$
1998	97000000
1999	101000000
2000	92000000
2001	96000000
2002	112000000
2003	145000000
2004	162000000
2005	158000000
2006	210000000
2007	264000000
2008	345000000
2009	285000000
2010	247000000
2011	214000000
2012	196000000
2013	198000000
2014	205000000
2015	278000000
2016	290000000
2017	346000000
2018	378000000
2019	393000000
2020	163000000