Quarter	Millions of US Dollars
2005-04-01	12624
2005-07-01	3403
2005-10-01	2366
2006-01-01	7042
2006-04-01	4272
2006-07-01	3909
2006-10-01	2227
2007-01-01	7652
2007-04-01	8836
2007-07-01	-664
2007-10-01	4684
2008-01-01	8586
2008-04-01	9733
2008-07-01	-2553
2008-10-01	-4415
2009-01-01	-1054
2009-04-01	8125
2009-07-01	3880
2009-10-01	1546
2010-01-01	270
2010-04-01	15903
2010-07-01	8012
2010-10-01	10732
2011-01-01	10595
2011-04-01	9476
2011-07-01	10944
2011-10-01	-2001
2012-01-01	27112
2012-04-01	5165
2012-07-01	12822
2012-10-01	7363
2013-01-01	-51
2013-04-01	-972
2013-07-01	220
2013-10-01	8032
2014-01-01	8631
2014-04-01	127
2014-07-01	11135
2014-10-01	7313
2015-01-01	-7056
2015-04-01	-1998
2015-07-01	-3115
2015-10-01	11616
2016-01-01	3455
2016-04-01	3898
2016-07-01	1209
2016-10-01	789
2017-01-01	6962
2017-04-01	8569
2017-07-01	4191
2017-10-01	6760
2018-01-01	10235