Year	current US$
1995	20000000
1996	24000000
1997	25000000
1998	32000000
1999	47000000
2000	41000000
2001	55000000
2002	63000000
2003	89000000
2004	93000000
2005	82000000
2006	106000000
2007	123000000
2008	143000000
2009	145000000
2010	138000000
2011	142000000
2012	135000000
2013	127000000
2014	115000000
2015	109000000
2016	79000000
2017	100000000
2018	112000000
2019	107000000
2020	59000000