Quarter	Millions of US Dollars
1996-10-01	1200
1999-04-01	1000
2000-04-01	1400
2002-01-01	-73
2002-07-01	-36
2003-01-01	-36
2003-10-01	700
2004-01-01	592
2004-07-01	-36
2005-01-01	-36
2005-07-01	2214
2006-01-01	-36
2006-04-01	1150
2006-07-01	1514
2006-10-01	1490
2007-07-01	300
2009-04-01	2000
2009-07-01	1485
2009-10-01	7000
2010-01-01	-80
2010-04-01	550
2010-07-01	3420
2010-10-01	-4
2011-01-01	-80
2011-04-01	-650
2011-07-01	-80
2011-10-01	4500
2012-01-01	-1080
2012-07-01	4189
2012-10-01	1450
2013-01-01	1000
2013-04-01	174
2013-07-01	680
2013-10-01	688
2014-01-01	16
2014-04-01	-1948
2014-07-01	-1334
2014-10-01	563
2015-01-01	-3032
2015-04-01	-631
2015-07-01	-689
2015-10-01	-1124
2016-01-01	110
2016-04-01	9395
2016-07-01	-614
2016-10-01	-375
2017-01-01	-1966
2017-04-01	196
2017-07-01	-277
2017-10-01	-1326
2018-01-01	-2166
2018-04-01	12199