Year	current US$
1995	3000000
1996	9000000
1997	17000000
1998	20000000
1999	47000000
2000	71000000
2001	79000000
2002	78000000
2003	106000000
2004	61000000
2005	444000000
2006	440000000
2007	542000000
2008	632000000
2009	501000000
2010	493000000
2011	563000000
2012	571000000
2013	620000000
2014	676000000
2015	626000000
2016	572000000
2017	580000000
2018	600000000
2019	611000000
2020	175000000