Year	current US$
1995	8000000
1996	8000000
1997	4000000
1998	2000000
1999	2000000
2000	5000000
2001	3000000
2002	108000000
2003	17000000
2004	21000000
2005	114000000
2006	194000000
2007	390000000
2008	255000000
2009	231000000
2010	82000000
2011	179000000
2012	772000000
2013	773000000
2014	967000000
2015	949000000
2016	1009000000
2017	1029000000
2018	1043000000
2019	821000000
2020	689000000