Year	current US$
1995	19000000
1996	15000000
1997	7000000
1998	11000000
1999	10000000
2000	6000000
2001	10000000
2002	5000000
2003	9000000
2004	14000000
2005	24000000
2006	55000000
2007	117000000
2008	113000000
2009	82000000
2010	74000000
2011	89000000
2012	140000000
2013	155000000
2014	155000000
2015	140000000
2016	99000000
2017	145000000
2018	169000000
2019	137000000
2020	27000000