Year	current US$
1995	23000000
1996	26000000
1997	27000000
1998	29000000
1999	30000000
2000	31000000
2001	32000000
2002	33000000
2003	35000000
2004	38000000
2005	40000000
2006	45000000
2007	52000000
2008	58000000
2009	54000000
2010	51000000
2011	49000000
2012	49000000
2013	50000000
2014	66000000
2015	70000000
2016	77000000
2017	82000000
2018	86000000
2019	92000000
2020	27000000