Year	current US$
1995	21000000
1996	4000000
1997	4000000
1998	85000000
1999	91000000
2000	100000000
2001	105000000
2002	119000000
2003	138000000
2004	186000000
2005	303000000
2006	345000000
2007	558000000
2008	542000000
2009	684000000
2010	574000000
2011	464000000
2012	464000000
2013	473000000
2014	458000000
2015	737000000
2016	792000000
2017	693000000
2018	450000000
2019	328000000
2020	105000000