Year	current US$
1995	27000000
1996	38000000
1997	24000000
1998	39000000
1999	31000000
2000	34000000
2001	35000000
2002	51000000
2003	63000000
2004	82000000
2005	103000000
2006	91000000
2007	236000000
2008	293000000
2009	554000000
2010	726000000
2011	653000000
2012	711000000
2013	1241000000
2014	1597000000
2015	1171000000
2016	628000000
2017	884000000
2018	557000000
2019	395000000
2020	19000000