Year	constant 2010 US$
1998	18025587435.537
1999	18818501516.7279
2000	17941629799.4492
2001	17287686613.0474
2002	18508746991.4208
2003	19019488501.2703
2004	21255544084.1347
2005	22406608373.3623
2006	22327599221.647
2007	26783591796.24
2008	27655555413.6948
2009	30637308057.0936
2010	33637786362.8615
2011	35201347127.6312
2012	39937419234.5273
2013	44122622260.6633
2014	45111698681.5169
2015	46583932317.2293
2016	51682459241.0576
2017	54609671738.8646