Year	current US$
1995	498000000
1996	453000000
1997	445000000
1998	441000000
1999	496000000
2000	497000000
2001	294000000
2002	281000000
2003	341000000
2004	432000000
2005	561000000
2006	540000000
2007	653000000
2008	751000000
2009	623000000
2010	718000000
2011	725000000
2012	734000000
2013	769000000
2014	729000000
2015	706000000
2016	704000000
2017	768000000
2018	823000000
2019	839000000
2020	161000000