Year	current US$
1995	13000000
1996	12000000
1997	14000000
1998	13000000
1999	14000000
2000	192000000
2001	163000000
2002	162000000
2003	238000000
2004	271000000
2005	262000000
2006	260000000
2007	268000000
2008	243000000
2009	239000000
2010	270000000
2011	290000000
2012	245000000
2013	206000000
2014	170000000
2015	174000000
2016	258000000
2017	303000000
2018	342000000
2019	319000000
2020	276000000