Year	current US$
1995	19000000
1996	19000000
1997	20000000
1998	20000000
1999	21000000
2000	22000000
2001	23000000
2002	25000000
2003	27000000
2004	29000000
2005	31000000
2006	49000000
2007	82000000
2008	51000000
2009	81000000
2010	86000000
2011	103000000
2012	240000000
2013	157000000
2014	130000000
2015	92000000
2016	106000000
2017	69000000
2018	52000000
2019	65000000
2020	81000000