Quarter	Millions of US Dollars
1969-01-01	27
1969-04-01	15
1969-10-01	50
1970-07-01	75
1971-01-01	75
1971-04-01	2
1971-07-01	55
1971-10-01	86
1972-01-01	155
1972-04-01	596
1972-07-01	203
1972-10-01	499
1973-01-01	105
1973-04-01	345
1973-07-01	217
1973-10-01	533
1974-01-01	456
1974-04-01	595
1974-07-01	439
1974-10-01	583
1975-01-01	730
1975-04-01	898
1975-07-01	1042
1975-10-01	2288
1976-01-01	3275
1976-04-01	1619
1976-07-01	1788
1976-10-01	2189
1977-01-01	1188
1977-04-01	1295
1977-07-01	1558
1977-10-01	1034
1978-01-01	1428
1978-04-01	1728
1978-07-01	752
1978-10-01	910
1979-01-01	1790
1979-04-01	715
1979-07-01	708
1979-10-01	402
1980-01-01	638
1980-04-01	1306
1980-07-01	-285
1980-10-01	729
1981-01-01	816
1981-04-01	2271
1981-07-01	2373
1981-10-01	3614
1982-01-01	3308
1982-04-01	2153
1982-07-01	2916
1982-10-01	1209
1983-01-01	1112
1983-04-01	2057
1983-07-01	251
1983-10-01	1126
1984-01-01	1479
1984-04-01	1209
1984-07-01	1229
1984-10-01	1106
1985-01-01	1277
1985-04-01	1288
1985-07-01	1871
1985-10-01	619
1986-01-01	3671
1986-04-01	3272
1986-07-01	3459
1986-10-01	2616
1987-01-01	516
1987-04-01	1072
1987-07-01	262
1987-10-01	1238
1988-01-01	-494
1988-04-01	1704
1988-07-01	2294
1988-10-01	1937
1989-01-01	3210
1989-04-01	299
1989-07-01	73
1989-10-01	825
1990-01-01	1835
1990-04-01	1376
1990-07-01	-613
1990-10-01	1877
1991-01-01	4517
1991-04-01	4484
1991-07-01	1308
1991-10-01	4204
1992-01-01	1379
1992-04-01	4041
1992-07-01	2397
1992-10-01	2286
1993-01-01	10267
1993-04-01	3192
1993-07-01	5594
1993-10-01	-340
1994-01-01	7781
1994-04-01	2826
1994-07-01	6326
1994-10-01	-706
1995-01-01	2035
1995-04-01	1741
1995-07-01	5770
1995-10-01	-653
1996-01-01	753
1996-04-01	1962
1996-07-01	2279
1996-10-01	3548
1997-01-01	3904
1997-04-01	4324
1997-07-01	2687
1997-10-01	-1420
1998-01-01	4973
1998-04-01	5394
1998-07-01	3743
1998-10-01	3983
1999-01-01	330
1999-04-01	7508
1999-07-01	695
1999-10-01	2125
2000-01-01	68
2000-04-01	-5003
2000-07-01	85
2000-10-01	-909
2001-01-01	3880
2001-04-01	3754
2001-07-01	3293
2001-10-01	6707
2002-01-01	7204
2002-04-01	2961
2002-07-01	5524
2002-10-01	3055
2003-01-01	-804
2003-04-01	9717
2003-07-01	4567
2003-10-01	11576
2004-01-01	-439
2004-04-01	-2528
2004-07-01	9537
2004-10-01	4884
2005-01-01	1424
2005-04-01	6534
2005-07-01	-2644
2005-10-01	9093
2006-01-01	4350
2006-04-01	-1960
2006-07-01	9284
2006-10-01	13755
2007-01-01	10597
2007-04-01	16045
2007-07-01	2728
2007-10-01	17864
2008-01-01	5458
2008-04-01	49436
2008-07-01	13850
2008-10-01	-9895
2009-01-01	12508
2009-04-01	24341
2009-07-01	3934
2009-10-01	24136
2010-01-01	7899
2010-04-01	28377
2010-07-01	18831
2010-10-01	22680
2011-01-01	11915
2011-04-01	21261
2011-07-01	-17
2011-10-01	16896
2012-01-01	26853
2012-04-01	-7783
2012-07-01	14582
2012-10-01	4452
2013-01-01	3676
2013-04-01	-8244
2013-07-01	42297
2013-10-01	27077
2014-01-01	8671
2014-04-01	13071
2014-07-01	16268
2014-10-01	2539
2015-01-01	25342
2015-04-01	-7189
2015-07-01	20198
2015-10-01	-4611
2016-01-01	19653
2016-04-01	25292
2016-07-01	14951
2016-10-01	-6314
2017-01-01	12737
2017-04-01	23073
2017-07-01	6870
2017-10-01	16900
2018-01-01	24039
2018-04-01	14651