Year	current US$
1995	186000000
1996	205000000
1997	208000000
1998	249000000
1999	250000000
2000	296000000
2001	180000000
2002	203000000
2003	210000000
2004	220000000
2005	248000000
2006	303000000
2007	307000000
2008	353000000
2009	305000000
2010	285000000
2011	324000000
2012	354000000
2013	322000000
2014	246000000
2015	431000000
2016	231000000
2017	330000000
2018	461000000
2019	498000000
2020	127000000