Quarter	Millions of US Dollars
1969-10-01	50
1971-01-01	55
1971-04-01	2
1971-07-01	31
1971-10-01	56
1972-01-01	155
1972-04-01	166
1972-07-01	40
1972-10-01	306
1973-01-01	71
1973-04-01	146
1973-07-01	167
1973-10-01	210
1974-01-01	177
1974-04-01	340
1974-07-01	294
1974-10-01	271
1975-01-01	354
1975-04-01	113
1975-07-01	643
1975-10-01	1227
1976-01-01	2438
1976-04-01	875
1976-07-01	702
1976-10-01	1313
1977-01-01	487
1977-04-01	495
1977-07-01	980
1977-10-01	594
1978-01-01	524
1978-04-01	545
1978-07-01	226
1978-10-01	96
1979-01-01	363
1979-04-01	516
1979-07-01	215
1979-10-01	342
1980-01-01	268
1980-04-01	579
1980-07-01	-160
1980-10-01	670
1981-01-01	594
1981-04-01	815
1981-07-01	1541
1981-10-01	1591
1982-01-01	1402
1982-04-01	720
1982-07-01	1241
1982-10-01	599
1983-01-01	678
1983-04-01	638
1983-07-01	320
1983-10-01	-130
1984-01-01	622
1984-04-01	442
1984-07-01	163
1984-10-01	203
1985-01-01	25
1985-04-01	617
1985-07-01	423
1985-10-01	-129
1986-01-01	1042
1986-04-01	463
1986-07-01	490
1986-10-01	-274
1987-01-01	319
1987-04-01	568
1987-07-01	-261
1987-10-01	321
1988-01-01	-480
1988-04-01	284
1988-07-01	-119
1988-10-01	-350
1989-01-01	560
1989-04-01	216
1989-07-01	275
1989-10-01	-84
1990-01-01	1081
1990-04-01	1415
1990-07-01	-500
1990-10-01	862
1991-01-01	4087
1991-04-01	1962
1991-07-01	373
1991-10-01	2884
1992-01-01	1008
1992-04-01	2955
1992-07-01	1379
1992-10-01	167
1993-01-01	2558
1993-04-01	2359
1993-07-01	479
1993-10-01	-693
1994-01-01	1097
1994-04-01	-268
1994-07-01	1093
1994-10-01	162
1995-01-01	190
1995-04-01	-933
1995-07-01	1559
1995-10-01	-504
1996-01-01	-1674
1996-04-01	1124
1996-07-01	-92
1996-10-01	963
1997-01-01	560
1997-04-01	1699
1997-07-01	457
1997-10-01	639
1998-01-01	109
1998-04-01	3077
1998-07-01	2048
1998-10-01	265
1999-01-01	-1620
1999-04-01	2483
1999-07-01	3321
1999-10-01	204
2000-01-01	273
2000-04-01	152
2000-07-01	2598
2000-10-01	-415
2001-01-01	4231
2001-04-01	4901
2001-07-01	2662
2001-10-01	4029
2002-01-01	2763
2002-04-01	-35
2002-07-01	93
2002-10-01	-1376
2003-01-01	1081
2003-04-01	385
2003-07-01	-697
2003-10-01	5070
2004-01-01	-521
2004-04-01	494
2004-07-01	1742
2004-10-01	3020
2005-01-01	-153
2005-04-01	1731
2005-07-01	-1198
2005-10-01	642
2006-01-01	-1290
2006-04-01	-2081
2006-07-01	1876
2006-10-01	2682
2007-01-01	4235
2007-04-01	2710
2007-07-01	3234
2007-10-01	5073
2008-01-01	-4893
2008-04-01	8855
2008-07-01	7262
2008-10-01	-971
2009-01-01	4140
2009-04-01	10699
2009-07-01	3676
2009-10-01	3845
2010-01-01	1505
2010-04-01	-98
2010-07-01	7285
2010-10-01	6111
2011-01-01	-258
2011-04-01	3463
2011-07-01	-5521
2011-10-01	3307
2012-01-01	3791
2012-04-01	3123
2012-07-01	5155
2012-10-01	7742
2013-01-01	3642
2013-04-01	7488
2013-07-01	5371
2013-10-01	10504
2014-01-01	6127
2014-04-01	2224
2014-07-01	3240
2014-10-01	7225
2015-01-01	12390
2015-04-01	-1743
2015-07-01	726
2015-10-01	1061
2016-01-01	-391
2016-04-01	2722
2016-07-01	1593
2016-10-01	6149
2017-01-01	10385
2017-04-01	5264
2017-07-01	5536
2017-10-01	3896
2018-01-01	3942
2018-04-01	1355