Year	current US$
1995	67000000
1996	19000000
1997	16000000
1998	490000000
1999	403000000
2000	467000000
2001	891000000
2002	1357000000
2003	1033000000
2004	1044000000
2005	791000000
2006	1216000000
2007	1677000000
2008	1737000000
2009	2055000000
2010	2438000000
2011	2348000000
2012	2345000000
2013	3054000000
2014	3841000000
2015	4388000000
2016	4288000000
2017	4193000000
2018	5024000000