Quarter	Millions of US Dollars
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	0
1980-04-01	0
1980-07-01	0
1980-10-01	0
1981-01-01	0
1981-04-01	0
1981-07-01	0
1981-10-01	0
1982-01-01	0
1982-04-01	0
1982-07-01	0
1982-10-01	0
1983-01-01	0
1983-04-01	0
1983-07-01	38
1983-10-01	37
1984-01-01	39
1984-04-01	36
1984-07-01	30
1984-10-01	72
1985-01-01	72
1985-04-01	72
1985-07-01	44
1985-10-01	25
1986-01-01	25
1986-04-01	25
1986-07-01	25
1986-10-01	18
1987-01-01	18
1987-04-01	18
1987-07-01	86
1987-10-01	82
1988-01-01	121
1988-04-01	112
1988-07-01	177
1988-10-01	190
1989-01-01	143
1989-04-01	132
1989-07-01	0
1989-10-01	75
1990-01-01	75
1990-04-01	141
1990-07-01	154
1990-10-01	74
1991-01-01	71
1991-04-01	184
1991-07-01	178
1991-10-01	178
1992-01-01	232
1992-04-01	58
1992-07-01	63
1992-10-01	491
1993-01-01	456
1993-04-01	481
1993-07-01	497
1993-10-01	58
1994-01-01	94
1994-04-01	550
1994-07-01	630
1994-10-01	630
1995-01-01	130
1995-04-01	182
1995-07-01	102
1995-10-01	102
1996-01-01	90
1996-04-01	155
1996-07-01	421
1996-10-01	867
1997-01-01	1185
1997-04-01	1198
1997-07-01	935
1997-10-01	1001
1998-01-01	658
1998-04-01	850
1998-07-01	1196
1998-10-01	1544
1999-01-01	1368
1999-04-01	1322
1999-07-01	493
1999-10-01	632
2000-01-01	1209
2000-04-01	1320
2000-07-01	1455
2000-10-01	916
2001-01-01	617
2001-04-01	258
2001-07-01	263
2001-10-01	262
2002-01-01	185
2002-04-01	320
2002-07-01	150
2002-10-01	150
2003-01-01	270
2003-04-01	120
2003-07-01	120
2003-10-01	120
2004-01-01	0
2004-04-01	17
2004-07-01	61
2004-10-01	508
2005-01-01	509
2005-04-01	728
2005-07-01	1079
2005-10-01	680
2006-01-01	1882
2006-04-01	792
2006-07-01	392
2006-10-01	522
2007-01-01	321
2007-04-01	772
2007-07-01	826
2007-10-01	954
2008-01-01	1251
2008-04-01	849
2008-07-01	801
2008-10-01	625
2009-01-01	325
2009-04-01	125
2009-07-01	342
2009-10-01	417
2010-01-01	1032
2010-04-01	1032
2010-07-01	815
2010-10-01	775
2011-01-01	205
2011-04-01	330
2011-07-01	413
2011-10-01	588
2012-01-01	668
2012-04-01	993
2012-07-01	1060
2012-10-01	725
2013-01-01	1900
2013-04-01	3500
2013-07-01	3725
2013-10-01	4525
2014-01-01	3505
2014-04-01	2985
2014-07-01	2610
2014-10-01	1810
2015-01-01	2480
2015-04-01	950
2015-07-01	950
2015-10-01	1100
2016-01-01	1650
2016-04-01	2490
2016-07-01	3220
2016-10-01	3139
2017-01-01	4588
2017-04-01	5080
2017-07-01	4552
2017-10-01	6479
2018-01-01	9041
2018-04-01	8263