Year	current US$
1995	5000000
1996	17000000
1997	7000000
1998	6000000
1999	7000000
2000	9000000
2001	5000000
2002	5000000
2003	15000000
2004	21000000
2005	26000000
2006	45000000
2007	101000000
2008	135000000
2009	185000000
2010	167000000
2011	201000000
2012	160000000
2013	197000000
2014	149000000
2015	114000000
2016	128000000
2017	107000000
2018	120000000
2019	129000000
2020	109000000