Quarter	Millions of US Dollars
1995-07-01	300
1996-04-01	100
1997-04-01	148
1997-07-01	100
1997-10-01	400
1998-04-01	1000
1998-07-01	350
1998-10-01	100
1999-01-01	536
1999-04-01	0
1999-10-01	663
2000-04-01	500
2000-07-01	272
2000-10-01	834
2001-01-01	-31
2001-04-01	1050
2001-07-01	1100
2001-10-01	250
2002-01-01	1000
2002-04-01	733
2002-07-01	750
2002-10-01	3320
2003-01-01	700
2003-04-01	360
2003-07-01	-476
2003-10-01	-7
2004-01-01	-887
2004-04-01	1285
2004-07-01	1315
2004-10-01	2132
2005-01-01	-1118
2005-04-01	221
2005-07-01	-239
2005-10-01	750
2006-01-01	890
2006-04-01	2939
2006-07-01	-93
2006-10-01	-241
2007-01-01	-250
2007-04-01	3
2007-07-01	338
2007-10-01	-169
2008-01-01	6
2008-04-01	382
2008-07-01	-250
2009-01-01	2100
2009-04-01	-306
2009-07-01	-352
2009-10-01	-2014
2010-01-01	135
2010-10-01	1020
2011-01-01	530
2011-04-01	0
2011-07-01	1150
2011-10-01	2947
2012-01-01	-600
2012-04-01	3260
2012-07-01	-800
2012-10-01	3865
2013-01-01	-875
2013-04-01	2500
2013-07-01	175
2014-04-01	498
2015-01-01	1950
2015-04-01	-500
2015-07-01	-500
2015-10-01	1600
2016-01-01	-318
2016-04-01	2000
2016-10-01	130
2017-01-01	1500
2017-07-01	-300
2017-10-01	-3628
2018-01-01	-700
2018-04-01	4600