Quarter	Millions of US Dollars
1967-04-01	25
1968-04-01	30
1968-10-01	20
1971-01-01	56
1971-04-01	70
1972-10-01	90
1973-01-01	22
1974-04-01	50
1974-10-01	32
1975-01-01	34
1975-04-01	27
1975-10-01	19
1976-01-01	60
1976-04-01	140
1976-10-01	25
1977-01-01	88
1977-04-01	197
1977-10-01	120
1978-01-01	-5
1978-04-01	93
1978-07-01	8
1978-10-01	26
1979-01-01	266
1979-04-01	259
1979-07-01	100
1979-10-01	18
1980-01-01	250
1980-04-01	348
1980-07-01	291
1980-10-01	115
1981-01-01	190
1981-04-01	-87
1981-10-01	483
1982-01-01	867
1982-04-01	183
1982-07-01	175
1982-10-01	605
1983-01-01	220
1983-04-01	238
1983-07-01	155
1983-10-01	1112
1984-01-01	609
1984-04-01	120
1984-07-01	826
1984-10-01	1633
1985-01-01	1020
1985-04-01	1659
1985-07-01	1130
1985-10-01	766
1986-01-01	286
1986-04-01	1520
1986-07-01	1306
1986-10-01	656
1987-01-01	286
1987-04-01	647
1987-07-01	214
1987-10-01	3648
1988-01-01	896
1988-04-01	1513
1988-07-01	1373
1988-10-01	213
1989-01-01	1250
1989-04-01	649
1989-07-01	1119
1989-10-01	733
1990-01-01	362
1990-04-01	2636
1990-07-01	2783
1990-10-01	1243
1991-01-01	5754
1991-04-01	50
1991-07-01	649
1991-10-01	375
1992-01-01	1629
1992-04-01	2855
1992-07-01	-9
1992-10-01	-560
1993-01-01	2294
1993-04-01	1377
1993-07-01	11699
1993-10-01	2328
1994-01-01	3488
1994-04-01	1869
1994-07-01	5490
1994-10-01	5365
1995-01-01	220
1995-04-01	6867
1995-07-01	5576
1995-10-01	3739
1996-01-01	1230
1996-04-01	5563
1996-07-01	2038
1996-10-01	3542
1997-01-01	4813
1997-04-01	6365
1997-07-01	3990
1997-10-01	4041
1998-01-01	3269
1998-04-01	8768
1998-07-01	-270
1998-10-01	5659
1999-01-01	5652
1999-04-01	25886
1999-07-01	13289
1999-10-01	13510
2000-01-01	15433
2000-04-01	21055
2000-07-01	12845
2000-10-01	15330
2001-01-01	22645
2001-04-01	17340
2001-07-01	10768
2001-10-01	28405
2002-01-01	11853
2002-04-01	-696
2002-07-01	6315
2002-10-01	7888
2003-01-01	20798
2003-04-01	7600
2003-07-01	9427
2003-10-01	24996
2004-01-01	25627
2004-04-01	31112
2004-07-01	3232
2004-10-01	25616
2005-01-01	17072
2005-04-01	34281
2005-07-01	-7693
2005-10-01	24577
2006-01-01	18368
2006-04-01	32912
2006-07-01	20556
2006-10-01	30897
2007-01-01	28364
2007-04-01	54837
2007-07-01	4620
2007-10-01	17490
2008-01-01	28151
2008-04-01	47278
2008-07-01	-3075
2008-10-01	57002
2009-01-01	29532
2009-04-01	9189
2009-07-01	34596
2009-10-01	27981
2010-01-01	816
2010-04-01	-9220
2010-07-01	43105
2010-10-01	-1241
2011-01-01	22050
2011-04-01	8314
2011-07-01	-7348
2011-10-01	1835
2012-01-01	-31116
2012-04-01	-32013
2012-07-01	-5549
2012-10-01	-65
2013-01-01	-18794
2013-04-01	-1462
2013-07-01	19195
2013-10-01	7563
2014-01-01	-4505
2014-04-01	-848
2014-07-01	-33673
2014-10-01	-3907
2015-01-01	1478
2015-04-01	-29
2015-07-01	-11783
2015-10-01	-9966
2016-01-01	-17084
2016-04-01	4057
2016-07-01	-10078
2016-10-01	-5033
2017-01-01	4017
2017-04-01	19642
2017-07-01	4733
2017-10-01	-1143
2018-01-01	4578
2018-04-01	-4880