Year	current US$
1995	21000000
1996	10000000
1997	13000000
1998	35000000
1999	36000000
2000	36000000
2001	39000000
2002	130000000
2003	143000000
2004	185000000
2005	177000000
2006	225000000
2007	307000000
2008	247000000
2009	235000000
2010	244000000
2011	156000000
2012	177000000
2013	197000000
2014	215000000
2015	246000000
2016	316000000
2017	396000000
2018	461000000
2019	513000000
2020	29000000