Year	current US$
1997	17000000
1998	28000000
1999	33000000
2000	32000000
2001	36000000
2002	24000000
2003	22000000
2004	25000000
2005	23000000
2006	37000000
2007	21000000
2008	25000000
2009	40000000
2010	31000000
2011	29000000
2012	36000000
2013	67000000
2014	83000000
2015	93000000
2016	70000000
2017	66000000
2018	80000000
2019	87099998.4741211