Year	current US$
1998	81000000
1999	83000000
2000	73000000
2001	74000000
2002	85000000
2003	106000000
2004	117000000
2005	122000000
2006	170000000
2007	203000000
2008	281000000
2009	231000000
2010	194000000
2011	160000000
2012	139000000
2013	133000000
2014	127000000
2015	206000000
2016	225000000
2017	249000000
2018	273000000
2019	285000000
2020	112000000