Year	current US$
1995	59000000
1996	62000000
1997	65000000
1998	99000000
1999	171000000
2000	127000000
2001	137000000
2002	140000000
2003	144000000
2004	80000000
2005	94000000
2006	86000000
2007	83000000
2008	88000000
2009	81000000
2010	83000000
2011	88000000
2012	92000000
2013	89000000
2014	88000000
2015	92000000
2016	98000000
2017	88000000
2018	69000000
2019	67000000
2020	19000000