Year	current US$
1995	28000000
1996	44000000
1997	60000000
1998	54000000
1999	34000000
2000	87000000
2001	86000000
2002	94000000
2003	99000000
2004	153000000
2005	184000000
2006	156000000
2007	161000000
2008	155000000
2009	146000000
2010	141000000
2011	101000000
2012	98000000
2013	100000000
2014	116000000
2015	109000000
2016	111000000
2017	183000000
2018	187000000
2019	179000000
2020	56000000