Quarter	Millions of US Dollars
1994-07-01	16
1994-10-01	-10
1995-07-01	306
1995-10-01	8
1996-01-01	50
1996-04-01	106
1996-07-01	127
1996-10-01	269
1997-01-01	72
1997-04-01	481
1997-07-01	90
1997-10-01	799
1998-01-01	1
1998-04-01	981
1998-07-01	501
1998-10-01	188
1999-01-01	573
1999-04-01	60
1999-07-01	26
1999-10-01	582
2000-01-01	-17
2000-04-01	594
2000-07-01	254
2000-10-01	979
2001-01-01	-16
2001-04-01	990
2001-07-01	1197
2001-10-01	-115
2002-01-01	952
2002-04-01	386
2002-07-01	845
2002-10-01	3273
2003-01-01	700
2003-04-01	274
2003-07-01	-442
2003-10-01	18
2004-01-01	-935
2004-04-01	1210
2004-07-01	1315
2004-10-01	2145
2005-01-01	-1165
2005-04-01	2177
2005-07-01	-182
2005-10-01	995
2006-01-01	890
2006-04-01	2870
2006-07-01	-199
2006-10-01	-347
2007-01-01	-250
2007-04-01	3
2007-07-01	188
2007-10-01	-229
2008-01-01	6
2008-04-01	382
2008-07-01	-310
2009-01-01	2100
2009-04-01	-306
2009-07-01	-352
2009-10-01	-2001
2010-01-01	337
2010-04-01	-100
2010-07-01	-170
2010-10-01	1020
2011-01-01	530
2011-04-01	300
2011-07-01	1150
2011-10-01	2647
2012-01-01	-802
2012-04-01	3229
2012-07-01	-800
2012-10-01	4065
2013-01-01	-875
2013-04-01	2500
2013-07-01	175
2014-04-01	498
2015-01-01	1950
2015-04-01	-2500
2015-07-01	-500
2015-10-01	1600
2016-01-01	-318
2016-04-01	2000
2016-10-01	130
2017-01-01	1581
2017-04-01	20
2017-07-01	-84
2017-10-01	-4139
2018-01-01	-691
2018-04-01	4901