Year	current US$
1995	52000000
1996	44000000
1997	38000000
1998	36000000
1999	45000000
2000	42000000
2001	26000000
2002	17000000
2003	18000000
2004	52000000
2005	96000000
2006	109000000
2007	73000000
2008	83000000
2009	70000000
2010	69000000
2011	69000000
2012	79000000
2013	92000000
2014	103000000
2015	99000000
2016	74000000
2017	61000000
2018	73000000
2019	64000000
2020	19000000