Year	current US$
1996	251000000
1997	314000000
1998	294000000
1999	375000000
2000	471000000
2001	341000000
2002	309000000
2003	389000000
2004	442000000
2005	371000000
2006	481000000
2007	530000000
2008	735000000
2009	651000000
2010	835000000
2011	819000000
2012	889000000
2013	1308000000
2014	782000000
2015	827000000
2016	843000000
2017	1127000000
2018	1207000000
2019	1389000000
2020	659000000