Year	current US$
1997	171000000
1998	239000000
1999	135000000
2000	129000000
2001	136000000
2002	189000000
2003	170000000
2004	196000000
2005	237000000
2006	257000000
2007	277000000
2008	337000000
2009	311000000
2010	329000000
2011	384000000
2012	471000000
2013	537000000
2014	563000000
2015	609000000
2016	706000000
2017	853000000
2018	960000000
2019	1124000000
2020	292000000