Year	current US$
1998	12000000
1999	18000000
2000	20000000
2001	32000000
2002	48000000
2003	62000000
2004	92000000
2005	94000000
2006	189000000
2007	392000000
2008	569000000
2009	300000000
2010	212000000
2011	405000000
2012	486000000
2013	585000000
2014	468000000
2015	482000000
2016	477000000
2017	480000000
2018	518000000
2019	708000000
2020	195000000