Year	current US$
1995	31000000
1996	30000000
1997	29000000
1998	34000000
1999	36000000
2000	26000000
2001	12000000
2002	14000000
2003	14000000
2004	35000000
2005	51000000
2006	14000000
2007	6000000
2008	6000000
2009	6000000
2010	8000000
2011	8000000
2012	8000000
2013	8000000
2014	8000000
2015	11000000
2016	9000000
2017	15000000
2018	17000000
2019	11000000
2020	4000000