Year	current US$
1995	49000000
1996	40000000
1997	38000000
1998	38000000
1999	40000000
2000	40000000
2001	36000000
2002	36000000
2003	48000000
2004	66000000
2005	77000000
2006	120000000
2007	137000000
2008	147000000
2009	102000000
2010	111000000
2011	119000000
2012	102000000
2013	118000000
2014	144000000
2015	150000000
2016	157000000
2017	160000000
2018	179000000