Year	current US$
1995	110000000
1996	105000000
1997	103000000
1998	87000000
1999	74000000
2000	81000000
2001	88000000
2002	97000000
2003	122000000
2004	179000000
2005	182000000
2006	255000000
2007	276000000
2008	316000000
2009	272000000
2010	305000000
2011	373000000
2012	339000000
2013	288000000
2014	282000000
2015	317000000
2016	322000000
2017	352000000
2018	390000000
2019	494000000
2020	439000000