Quarter	Millions of US Dollars
1992-07-01	200
1993-01-01	150
1994-01-01	200
1994-10-01	200
1995-01-01	200
1998-04-01	110
1999-10-01	1000
2000-01-01	-150
2000-04-01	1150
2002-04-01	600
2002-07-01	-200
2003-01-01	-600
2003-10-01	1100
2004-01-01	-200
2004-10-01	-200
2005-01-01	2350
2005-04-01	-110
2005-10-01	350
2006-04-01	144
2006-07-01	2915
2007-01-01	835
2008-01-01	175
2008-04-01	5036
2008-07-01	1639
2009-01-01	2025
2009-04-01	886
2009-10-01	500
2010-01-01	-268
2010-07-01	1000
2010-10-01	150
2011-01-01	600
2011-04-01	2106
2011-10-01	26
2012-01-01	-3650
2012-04-01	50
2012-07-01	12
2012-10-01	-350
2013-01-01	-575
2013-04-01	-221
2013-07-01	869
2013-10-01	-700
2014-04-01	-1141
2014-07-01	-658
2014-10-01	379
2015-01-01	-1275
2015-04-01	-150
2015-07-01	-51
2016-01-01	-300
2016-04-01	-2655
2016-07-01	-81
2016-10-01	400
2017-01-01	-4457
2017-04-01	5
2017-07-01	390
2018-01-01	-775
2018-04-01	7233