Year	current US$
1995	146000000
1996	100000000
1997	186000000
1998	170000000
1999	139000000
2000	132000000
2001	109000000
2002	105000000
2003	111000000
2004	126000000
2005	164000000
2006	201000000
2007	264000000
2008	343000000
2009	406000000
2010	782000000
2011	1689000000
2012	2477000000
2013	2877000000
2014	3008000000
2015	2603000000
2016	2494000000
2017	2658000000
2018	2284000000
2019	1702000000
2020	412000000