Year	current US$
1995	7000000
1996	6000000
1997	4000000
1998	4000000
1999	11000000
2000	16000000
2001	12000000
2002	10000000
2003	17000000
2004	50000000
2005	58000000
2006	92000000
2007	112000000
2008	304000000
2009	147000000
2010	148000000
2011	247000000
2012	350000000
2013	350000000
2014	390000000
2015	399000000
2016	461000000
2017	292000000
2018	314000000
2019	391000000
2020	89000000