Year	current US$
1995	25000000
1996	25000000
1997	40000000
1998	46000000
1999	51000000
2000	74000000
2001	44000000
2002	45000000
2003	50000000
2004	58000000
2005	77000000
2006	97000000
2007	107000000
2008	156000000
2009	138000000
2010	143000000
2011	170000000
2012	181000000
2013	214000000
2014	283000000
2015	372000000
2016	461000000
2017	356000000
2018	612000000
2019	661000000
2020	322000000