Year	current US$
1999	4000000
2000	14000000
2001	18000000
2002	2000000
2003	1000000
2004	6000000
2005	11000000
2006	17000000
2007	29000000
2008	33000000
2009	35000000
2010	31000000
2011	34000000
2012	61000000
2013	72000000
2014	78000000
2015	99000000
2016	45000000
2017	46000000
2018	3000000
2019	4000000
2020	5000000