Year	current US$
1995	113000000
1996	26000000
1997	48000000
1998	81000000
1999	92000000
2000	159000000
2001	113000000
2002	144000000
2003	194000000
2004	167000000
2005	307000000
2006	261000000
2007	331000000
2008	324000000
2009	330000000
2010	261000000
2011	275000000
2012	245000000
2013	310000000
2014	562000000
2015	410000000
2016	589000000
2017	366000000
2018	403000000
2019	132000000
2020	55000000