Quarter	Millions of US Dollars
1972-01-01	49
1972-04-01	78
1972-07-01	30
1972-10-01	86
1973-04-01	136
1973-07-01	38
1973-10-01	295
1974-01-01	94
1974-04-01	363
1974-07-01	30
1974-10-01	72
1975-01-01	64
1975-04-01	58
1975-07-01	46
1976-01-01	61
1976-04-01	56
1976-07-01	67
1976-10-01	167
1977-01-01	117
1977-04-01	52
1977-07-01	103
1977-10-01	68
1978-01-01	64
1978-04-01	129
1978-07-01	62
1978-10-01	170
1979-01-01	110
1979-04-01	75
1979-10-01	15
1980-07-01	90
1980-10-01	40
1981-01-01	7
1981-04-01	15
1981-07-01	80
1982-04-01	75
1982-07-01	0
1983-04-01	25
1983-07-01	60
1983-10-01	-110
1984-01-01	-110
1984-04-01	-8
1984-07-01	-30
1984-10-01	-15
1985-04-01	-136
1985-07-01	-88
1985-10-01	-343
1986-01-01	-101
1986-04-01	-78
1986-07-01	25
1986-10-01	-127
1987-01-01	-93
1987-04-01	-142
1987-07-01	-110
1987-10-01	-86
1988-01-01	-61
1988-04-01	-131
1988-07-01	-97
1988-10-01	-78
1989-01-01	-117
1989-04-01	-176
1989-10-01	-68
1990-01-01	-64
1990-04-01	-79
1990-07-01	-142
1990-10-01	-52
1991-04-01	949
1993-07-01	50
1994-01-01	-20
1994-04-01	-300
1994-07-01	-15
1995-10-01	111
1996-07-01	-105
1996-10-01	800
1997-04-01	75
1997-07-01	288
1997-10-01	900
1998-04-01	111
1998-07-01	364
1998-10-01	509
1999-01-01	811
1999-04-01	418
1999-07-01	85
1999-10-01	767
2000-01-01	1054
2000-04-01	196
2000-07-01	435
2000-10-01	378
2001-01-01	-70
2001-04-01	714
2001-07-01	360
2001-10-01	151
2002-01-01	605
2002-04-01	32
2002-07-01	59
2002-10-01	445
2003-01-01	208
2003-04-01	961
2003-07-01	145
2003-10-01	771
2004-01-01	1318
2004-04-01	1009
2004-07-01	0
2004-10-01	543
2005-01-01	-450
2005-04-01	-369
2005-07-01	-489
2005-10-01	766
2006-01-01	883
2006-04-01	-690
2006-07-01	26
2006-10-01	816
2007-01-01	-301
2007-04-01	164
2007-07-01	-568
2007-10-01	-694
2008-01-01	159
2008-04-01	1930
2008-07-01	-40
2008-10-01	-22
2009-01-01	682
2009-04-01	-77
2009-07-01	61
2009-10-01	-595
2010-01-01	1583
2010-04-01	1694
2010-07-01	-176
2010-10-01	104
2011-01-01	-45
2011-04-01	-450
2011-07-01	508
2011-10-01	4855
2012-01-01	2056
2012-04-01	946
2012-07-01	-392
2012-10-01	4854
2013-01-01	1071
2013-04-01	-1944
2013-07-01	527
2013-10-01	-376
2014-01-01	1462
2014-04-01	1527
2014-07-01	25
2014-10-01	3354
2015-01-01	5167
2015-04-01	-994
2015-07-01	-12
2015-10-01	2893
2016-01-01	1403
2016-04-01	2062
2016-07-01	20673
2016-10-01	-1820
2017-01-01	2138
2017-04-01	39
2017-07-01	-77
2017-10-01	-183
2018-01-01	4708
2018-04-01	-568