Quarter	Millions of US Dollars
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	0
1976-07-01	0
1976-10-01	0
1977-01-01	0
1977-04-01	0
1977-07-01	0
1977-10-01	0
1978-01-01	0
1978-04-01	0
1978-07-01	0
1978-10-01	0
1979-01-01	0
1979-04-01	0
1979-07-01	0
1979-10-01	0
1980-01-01	14
1980-04-01	59
1980-07-01	58
1980-10-01	74
1981-01-01	72
1981-04-01	87
1981-07-01	90
1981-10-01	116
1982-01-01	91
1982-04-01	33
1982-07-01	32
1982-10-01	72
1983-01-01	113
1983-04-01	165
1983-07-01	213
1983-10-01	264
1984-01-01	274
1984-04-01	179
1984-07-01	146
1984-10-01	312
1985-01-01	397
1985-04-01	397
1985-07-01	475
1985-10-01	454
1986-01-01	423
1986-04-01	662
1986-07-01	680
1986-10-01	604
1987-01-01	715
1987-04-01	613
1987-07-01	651
1987-10-01	656
1988-01-01	515
1988-04-01	224
1988-07-01	286
1988-10-01	285
1989-01-01	330
1989-04-01	369
1989-07-01	476
1989-10-01	592
1990-01-01	501
1990-04-01	508
1990-07-01	275
1990-10-01	247
1991-01-01	158
1991-04-01	253
1991-07-01	406
1991-10-01	487
1992-01-01	677
1992-04-01	793
1992-07-01	781
1992-10-01	760
1993-01-01	898
1993-04-01	736
1993-07-01	1017
1993-10-01	714
1994-01-01	363
1994-04-01	394
1994-07-01	533
1994-10-01	540
1995-01-01	741
1995-04-01	782
1995-07-01	1176
1995-10-01	877
1996-01-01	624
1996-04-01	410
1996-07-01	0
1996-10-01	37
1997-01-01	34
1997-04-01	34
1997-07-01	34
1997-10-01	362
1998-01-01	358
1998-04-01	352
1998-07-01	355
1998-10-01	10
1999-01-01	9
1999-04-01	82
1999-07-01	618
1999-10-01	582
2000-01-01	554
2000-04-01	486
2000-07-01	7
2000-10-01	0
2001-01-01	0
2001-04-01	161
2001-07-01	168
2001-10-01	153
2002-01-01	205
2002-04-01	163
2002-07-01	162
2002-10-01	173
2003-01-01	111
2003-04-01	0
2003-07-01	0
2003-10-01	631
2004-01-01	611
2004-04-01	1215
2004-07-01	1241
2004-10-01	755
2005-01-01	718
2005-04-01	1032
2005-07-01	1025
2005-10-01	937
2006-01-01	957
2006-04-01	636
2006-07-01	633
2006-10-01	659
2007-01-01	666
2007-04-01	0
2007-07-01	0
2007-10-01	0
2008-01-01	0
2008-04-01	3153
2008-07-01	2861
2008-10-01	2783
2009-01-01	2662
2009-04-01	0
2009-07-01	0
2009-10-01	0
2010-01-01	0
2010-04-01	0
2010-07-01	0
2010-10-01	0
2011-01-01	0
2011-04-01	1012
2011-07-01	2168
2011-10-01	2303
2012-01-01	2646
2012-04-01	1488
2012-07-01	676
2012-10-01	458
2013-01-01	1204
2013-04-01	1623
2013-07-01	1717
2013-10-01	4072
2014-01-01	4878
2014-04-01	6352
2014-07-01	6644
2014-10-01	4610
2015-01-01	4443
2015-04-01	3299
2015-07-01	2524
2015-10-01	2183
2016-01-01	1789
2016-04-01	1714
2016-07-01	4359
2016-10-01	4533
2017-01-01	4104
2017-04-01	6727
2017-07-01	4595
2017-10-01	5723
2018-01-01	7371
2018-04-01	5573