Year	current US$
1995	25000000
1996	26000000
1997	21000000
1998	18000000
1999	23000000
2000	21000000
2001	18000000
2002	19000000
2003	20000000
2004	22000000
2005	20000000
2006	20000000
2007	27000000
2008	37000000
2009	30000000
2010	25000000
2011	27000000
2012	28000000
2013	20000000
2014	22000000
2015	69000000
2016	67000000
2017	69000000
2018	75000000
2019	78000000
2020	19000000