Year	current US$
1995	72000000
1996	53000000
1997	53000000
1998	54000000
1999	54000000
2000	47000000
2001	43000000
2002	43000000
2003	55000000
2004	57000000
2005	65000000
2006	54000000
2007	253000000
2008	176000000
2009	157000000
2010	160000000
2011	151000000
2012	144000000
2013	150000000
2014	148000000
2015	133000000
2016	147000000
2017	154000000
2018	171000000