Quarter	Millions of US Dollars
1966-07-01	0
1966-10-01	0
1967-01-01	0
1967-04-01	0
1967-07-01	0
1967-10-01	0
1968-01-01	0
1968-04-01	0
1968-07-01	0
1968-10-01	0
1969-01-01	0
1969-04-01	0
1969-07-01	0
1969-10-01	0
1970-01-01	0
1970-04-01	0
1970-07-01	0
1970-10-01	0
1971-01-01	0
1971-04-01	0
1971-07-01	0
1971-10-01	0
1972-01-01	0
1972-04-01	0
1972-07-01	0
1972-10-01	0
1973-01-01	0
1973-04-01	0
1973-07-01	0
1973-10-01	0
1974-01-01	0
1974-04-01	0
1974-07-01	0
1974-10-01	0
1975-01-01	0
1975-04-01	0
1975-07-01	0
1975-10-01	0
1976-01-01	0
1976-04-01	8
1976-07-01	34
1976-10-01	89
1977-01-01	109
1977-04-01	103
1977-07-01	102
1977-10-01	68
1978-01-01	90
1978-04-01	139
1978-07-01	231
1978-10-01	450
1979-01-01	509
1979-04-01	496
1979-07-01	480
1979-10-01	337
1980-01-01	223
1980-04-01	235
1980-07-01	317
1980-10-01	276
1981-01-01	413
1981-04-01	506
1981-07-01	596
1981-10-01	599
1982-01-01	623
1982-04-01	558
1982-07-01	413
1982-10-01	618
1983-01-01	435
1983-04-01	508
1983-07-01	588
1983-10-01	592
1984-01-01	885
1984-04-01	794
1984-07-01	721
1984-10-01	1210
1985-01-01	1118
1985-04-01	1137
1985-07-01	1410
1985-10-01	1120
1986-01-01	1461
1986-04-01	1865
1986-07-01	2382
1986-10-01	2490
1987-01-01	2669
1987-04-01	2610
1987-07-01	2442
1987-10-01	2380
1988-01-01	1979
1988-04-01	2068
1988-07-01	1737
1988-10-01	1863
1989-01-01	1853
1989-04-01	1369
1989-07-01	1391
1989-10-01	1677
1990-01-01	1564
1990-04-01	1937
1990-07-01	2046
1990-10-01	2071
1991-01-01	2237
1991-04-01	2816
1991-07-01	2991
1991-10-01	4000
1992-01-01	4663
1992-04-01	4697
1992-07-01	5459
1992-10-01	4599
1993-01-01	5201
1993-04-01	5423
1993-07-01	5999
1993-10-01	5598
1994-01-01	3730
1994-04-01	4790
1994-07-01	5666
1994-10-01	5621
1995-01-01	6624
1995-04-01	5444
1995-07-01	5190
1995-10-01	6506
1996-01-01	7596
1996-04-01	6748
1996-07-01	5513
1996-10-01	6069
1997-01-01	6300
1997-04-01	6598
1997-07-01	6755
1997-10-01	5596
1998-01-01	4703
1998-04-01	5660
1998-07-01	9321
1998-10-01	11774
1999-01-01	11682
1999-04-01	11816
1999-07-01	9956
1999-10-01	9753
2000-01-01	13557
2000-04-01	12804
2000-07-01	13064
2000-10-01	10817
2001-01-01	12347
2001-04-01	12533
2001-07-01	11496
2001-10-01	10202
2002-01-01	13093
2002-04-01	14868
2002-07-01	12600
2002-10-01	12451
2003-01-01	14708
2003-04-01	14317
2003-07-01	12498
2003-10-01	13624
2004-01-01	18185
2004-04-01	20777
2004-07-01	26515
2004-10-01	26902
2005-01-01	35061
2005-04-01	33692
2005-07-01	31963
2005-10-01	28419
2006-01-01	30028
2006-04-01	35219
2006-07-01	33129
2006-10-01	32517
2007-01-01	43535
2007-04-01	56625
2007-07-01	59932
2007-10-01	41897
2008-01-01	52700
2008-04-01	49866
2008-07-01	50741
2008-10-01	57314
2009-01-01	58642
2009-04-01	53381
2009-07-01	46429
2009-10-01	43525
2010-01-01	49117
2010-04-01	51398
2010-07-01	55653
2010-10-01	55838
2011-01-01	70975
2011-04-01	60429
2011-07-01	70850
2011-10-01	64533
2012-01-01	58017
2012-04-01	55908
2012-07-01	52713
2012-10-01	59902
2013-01-01	70518
2013-04-01	65975
2013-07-01	69731
2013-10-01	64183
2014-01-01	53610
2014-04-01	48422
2014-07-01	46488
2014-10-01	44277
2015-01-01	42367
2015-04-01	42941
2015-07-01	45148
2015-10-01	42735
2016-01-01	48880
2016-04-01	43514
2016-07-01	51433
2016-10-01	45742
2017-01-01	45980
2017-04-01	44023
2017-07-01	30427
2017-10-01	31163
2018-01-01	31618
2018-04-01	34011