Year	current US$
1993	22800000
1994	519799999.99999994
1995	17000000
1996	6000000
1997	60200000
1998	48200000
1999	173600000
2001	72000000
2004	421700000
2005	30000000
2006	53100000
2007	306500000
2008	38900000
2009	288500000
2010	793000000
2011	267899999.99999997
2012	42300000
2013	140550000
2014	1046500000
2015	1424600000
2018	537300000
2020	14700000