Quarter	Millions of US Dollars
1996-10-01	1000
1997-01-01	1164
1997-04-01	2800
1997-10-01	500
1998-01-01	691
1998-04-01	4771
1998-07-01	6436
1998-10-01	-100
1999-07-01	-1
1999-10-01	-219
2000-04-01	-281
2000-07-01	20869
2001-04-01	-403
2001-10-01	-326
2002-04-01	-300
2002-10-01	-100
2003-01-01	-10
2003-04-01	-1690
2003-07-01	0
2004-01-01	-1278
2004-04-01	268
2004-10-01	1
2005-01-01	-838
2005-07-01	-3237
2006-01-01	-284
2006-04-01	-503
2006-07-01	-284
2006-10-01	2506
2007-01-01	-385
2007-04-01	-2400
2007-07-01	-385
2008-01-01	-385
2008-07-01	-385
2009-01-01	-690
2009-07-01	-690
2010-01-01	-690
2010-04-01	5500
2010-07-01	-508
2011-01-01	757
2011-04-01	1776
2011-07-01	-609
2011-10-01	-504
2012-01-01	-609
2012-04-01	12977
2012-07-01	-609
2013-01-01	-609
2013-07-01	6346
2014-01-01	-13068
2014-07-01	-609
2015-01-01	-609
2015-04-01	-2000
2015-07-01	-609
2016-01-01	-609
2016-04-01	1750
2016-07-01	641
2016-10-01	-439
2017-01-01	-609
2017-04-01	1000
2017-07-01	5795
2018-01-01	1809