Year	current US$
1995	18000000
1996	26000000
1997	28000000
1998	24000000
1999	38000000
2000	25000000
2001	25000000
2002	33000000
2003	54000000
2004	62000000
2005	29000000
2006	26000000
2007	29000000
2008	31000000
2009	33000000
2010	31000000
2011	31000000
2012	31000000
2013	29000000
2014	32000000
2015	35000000
2016	26000000
2017	31000000
2018	49000000
2019	55000000
2020	30000000