Year	current US$
1995	6000000
1996	7000000
1997	7000000
1998	8000000
1999	9000000
2000	9000000
2001	9000000
2002	9000000
2003	9000000
2004	9000000
2005	10000000
2006	10000000
2007	11000000
2008	11000000
2009	13000000
2010	13000000
2011	12000000
2012	12000000
2013	13000000
2014	26000000
2015	22000000
2016	23000000
2017	19000000
2018	20000000
2019	22000000
2020	6000000