Year	current US$
1995	20000000
1996	17000000
1997	21000000
1998	21000000
1999	22000000
2000	24000000
2001	49000000
2002	32000000
2003	3000000
2004	15000000
2005	89000000
2006	81000000
2007	91000000
2008	123000000
2009	114000000
2010	112000000
2011	138000000
2012	127000000
2013	123000000
2014	161000000
2015	99000000
2016	159000000
2017	155000000
2018	126000000
2019	142000000
2020	18000000