Year	current US$
1996	448000000
1997	477000000
1998	539000000
1999	503000000
2000	563000000
2001	759000000
2002	1001000000
2003	1204000000
2004	2931000000
2005	3542000000
2006	4018000000
2007	5320000000
2008	6722000000
2009	4349000000
2010	4696000000
2011	5406000000
2012	5988000000
2013	5931000000
2014	2264000000
2015	1662000000
2016	1723000000
2017	2019000000
2018	2269000000
2019	2595000000
2020	687000000