Year	current US$
1995	16000000
1996	23000000
1997	22000000
1998	37000000
1999	47000000
2000	57000000
2001	51000000
2002	72000000
2003	114000000
2004	174000000
2005	168000000
2006	162000000
2007	176000000
2008	377000000
2009	329000000
2010	522000000
2011	758000000
2012	607000000
2013	586000000
2014	352000000
2015	405000000
2016	347000000
2017	436000000
2018	968000000
2019	786000000
2020	1033000000