Quarter	Millions of US Dollars
1972-04-01	25
1973-04-01	17
1976-04-01	3
1976-07-01	7
1977-07-01	43
1978-04-01	68
1978-10-01	52
1979-01-01	103
1979-07-01	50
1980-04-01	-25
1981-04-01	-4
1982-01-01	314
1982-04-01	40
1982-10-01	300
1983-01-01	62
1983-04-01	212
1983-07-01	850
1983-10-01	107
1984-01-01	320
1984-04-01	6
1984-07-01	153
1984-10-01	600
1985-04-01	846
1985-07-01	12
1985-10-01	1060
1986-10-01	44
1987-04-01	82
1987-07-01	84
1987-10-01	-37
1988-01-01	233
1988-04-01	-328
1988-07-01	59
1988-10-01	-2
1989-01-01	124
1989-04-01	-260
1989-07-01	-105
1989-10-01	153
1990-04-01	-3
1990-07-01	200
1990-10-01	-152
1991-04-01	190
1992-01-01	-117
1992-04-01	-50
1992-10-01	-1074
1993-07-01	-700
1993-10-01	154
1994-01-01	200
1994-04-01	92
1994-07-01	-210
1994-10-01	160
1995-04-01	-498
1995-07-01	1550
1995-10-01	350
1996-01-01	354
1996-04-01	204
1996-07-01	145
1996-10-01	1988
1997-01-01	79
1997-04-01	1811
1997-07-01	554
1997-10-01	369
1998-01-01	-511
1998-04-01	7
1998-07-01	-161
1998-10-01	7
1999-01-01	400
1999-04-01	895
1999-07-01	627
1999-10-01	-114
2000-01-01	22
2000-04-01	168
2000-07-01	309
2000-10-01	1060
2001-01-01	9
2001-04-01	644
2001-07-01	918
2001-10-01	-70
2002-01-01	1180
2002-04-01	2725
2002-07-01	405
2002-10-01	1133
2003-01-01	-82
2003-04-01	54
2003-07-01	-842
2003-10-01	-568
2004-01-01	20
2004-04-01	-35
2004-07-01	1497
2004-10-01	442
2005-01-01	198
2005-04-01	819
2005-07-01	438
2005-10-01	-559
2006-01-01	1100
2006-04-01	-209
2006-07-01	215
2006-10-01	177
2007-01-01	-177
2007-04-01	-1060
2007-07-01	-130
2007-10-01	163
2008-01-01	1000
2008-07-01	440
2008-10-01	-600
2009-01-01	-576
2009-04-01	-2822
2009-07-01	3195
2009-10-01	-835
2010-01-01	350
2010-04-01	1440
2010-07-01	1189
2010-10-01	-260
2011-01-01	200
2011-04-01	121
2011-07-01	250
2011-10-01	-89
2012-01-01	1048
2012-04-01	2852
2012-07-01	1066
2012-10-01	535
2013-01-01	-79
2013-04-01	3230
2013-07-01	150
2013-10-01	726
2014-01-01	518
2014-04-01	600
2014-07-01	-893
2014-10-01	2110
2015-01-01	4299
2015-04-01	1025
2015-07-01	-992
2015-10-01	502
2016-01-01	532
2016-04-01	2169
2016-07-01	-1306
2016-10-01	2424
2017-01-01	376
2017-04-01	-510
2017-07-01	18
2017-10-01	1019
2018-01-01	-558
2018-04-01	-919