Quarter	Millions of US Dollars
1971-10-01	15
1972-01-01	64
1972-07-01	37
1972-10-01	46
1973-01-01	48
1973-04-01	13
1973-07-01	69
1974-01-01	16
1974-10-01	25
1975-01-01	94
1975-04-01	16
1975-07-01	46
1975-10-01	66
1976-04-01	24
1976-07-01	8
1976-10-01	45
1977-01-01	28
1977-04-01	34
1977-10-01	56
1978-01-01	104
1978-04-01	64
1978-07-01	53
1978-10-01	2
1979-01-01	-20
1979-04-01	38
1979-07-01	25
1980-01-01	-71
1980-04-01	-48
1980-07-01	-47
1980-10-01	-16
1981-04-01	23
1982-01-01	69
1982-07-01	3
1982-10-01	-24
1983-01-01	50
1983-04-01	21
1983-07-01	-9
1983-10-01	-45
1984-01-01	100
1984-04-01	150
1984-07-01	18
1984-10-01	-27
1985-01-01	141
1985-04-01	-10
1985-07-01	17
1985-10-01	16
1986-01-01	208
1986-04-01	65
1986-07-01	-6
1986-10-01	159
1987-01-01	37
1987-04-01	133
1987-07-01	91
1987-10-01	86
1988-01-01	330
1988-04-01	353
1988-07-01	-116
1988-10-01	9
1989-01-01	12
1989-04-01	15
1989-07-01	144
1989-10-01	50
1990-01-01	174
1990-04-01	11
1990-07-01	80
1990-10-01	22
1991-01-01	-72
1991-04-01	258
1991-07-01	67
1991-10-01	-34
1992-01-01	35
1992-04-01	165
1992-07-01	-109
1992-10-01	-183
1993-01-01	-274
1993-04-01	-228
1993-07-01	68
1993-10-01	-413
1994-01-01	-326
1994-04-01	-169
1994-07-01	31
1994-10-01	-151
1995-01-01	-96
1995-04-01	103
1995-07-01	-205
1995-10-01	-61
1996-01-01	5
1996-04-01	-337
1996-07-01	26
1996-10-01	-126
1997-01-01	147
1997-04-01	-13
1997-07-01	-262
1997-10-01	1216
1998-01-01	-84
1998-04-01	-80
1998-07-01	-3
1998-10-01	3
1999-01-01	198
1999-04-01	324
1999-07-01	-216
1999-10-01	390
2000-01-01	660
2000-04-01	947
2000-07-01	242
2000-10-01	682
2001-01-01	932
2001-04-01	950
2001-07-01	-278
2001-10-01	264
2002-01-01	49
2002-04-01	224
2002-07-01	-787
2002-10-01	684
2003-01-01	-148
2003-04-01	-57
2003-07-01	2914
2003-10-01	1373
2004-01-01	64
2004-04-01	627
2004-07-01	344
2004-10-01	330
2005-01-01	-2426
2005-04-01	813
2005-07-01	2
2005-10-01	-99
2006-01-01	-244
2006-04-01	2249
2006-07-01	-60
2006-10-01	-989
2007-01-01	-236
2007-04-01	-113
2007-07-01	-11
2007-10-01	-387
2008-01-01	-860
2008-04-01	-569
2008-07-01	-42
2008-10-01	-201
2009-01-01	4058
2009-04-01	3064
2009-07-01	527
2009-10-01	-402
2010-01-01	168
2010-04-01	-195
2010-07-01	1573
2010-10-01	-1055
2011-01-01	-34
2011-04-01	533
2011-07-01	-336
2011-10-01	-295
2012-01-01	4029
2012-04-01	231
2012-07-01	2198
2012-10-01	2825
2013-01-01	365
2013-04-01	919
2013-07-01	700
2013-10-01	-743
2014-01-01	-1316
2014-04-01	-2043
2014-07-01	36
2014-10-01	-767
2015-01-01	1112
2015-04-01	-318
2015-07-01	-2561
2015-10-01	-44
2016-01-01	720
2016-04-01	-1685
2016-07-01	-242
2016-10-01	-95
2017-01-01	28
2017-04-01	722
2017-07-01	47
2017-10-01	-1042
2018-01-01	-36
2018-04-01	-230