Year	current US$
1995	5000000
1996	6000000
1997	6000000
1998	8000000
1999	9000000
2000	10000000
2001	9000000
2002	8000000
2003	8000000
2004	13000000
2005	19000000
2006	36000000
2007	47000000
2008	47000000
2009	51000000
2010	64000000
2011	76000000
2012	93000000
2013	116000000
2014	99000000
2015	120000000
2016	139000000
2017	153000000
2018	121000000
2019	120000000
2020	84000000