Year	current US$
1996	68000000
1997	82000000
1998	97000000
1999	136000000
2000	108000000
2001	114000000
2002	113000000
2003	140000000
2004	134000000
2005	176000000
2006	179000000
2007	180000000
2008	208000000
2009	212000000
2010	216000000
2011	230000000
2012	186000000
2013	241000000
2014	253000000
2015	223000000
2016	245000000
2017	191000000
2018	132000000
2019	95000000
2020	90000000