Year	current US$
1997	171958000000
1998	178469000000
1999	174570000000
2000	187890000000
2001	190355000000
2002	215972000000
2003	255636000000
2004	306806000000
2005	334277000000
2006	366758000000
2007	431118000000
2008	473350000000
2009	371147000000
2010	407708000000
2011	475774000000
2012	446336000000
2013	468628000000
2014	472192000000
2015	396841000000
2016	398134000000
2017	429645000000
2018	468650000000
2019	446944000000
2020	419892000000