Quarter	Millions of US Dollars
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	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	20
1983-07-01	20
1983-10-01	20
1984-01-01	20
1984-04-01	0
1984-07-01	0
1984-10-01	6
1985-01-01	6
1985-04-01	36
1985-07-01	37
1985-10-01	30
1986-01-01	30
1986-04-01	0
1986-07-01	0
1986-10-01	8
1987-01-01	8
1987-04-01	33
1987-07-01	33
1987-10-01	143
1988-01-01	142
1988-04-01	113
1988-07-01	110
1988-10-01	6
1989-01-01	6
1989-04-01	6
1989-07-01	6
1989-10-01	6
1990-01-01	6
1990-04-01	39
1990-07-01	78
1990-10-01	80
1991-01-01	227
1991-04-01	192
1991-07-01	156
1991-10-01	330
1992-01-01	557
1992-04-01	696
1992-07-01	722
1992-10-01	641
1993-01-01	348
1993-04-01	214
1993-07-01	339
1993-10-01	613
1994-01-01	507
1994-04-01	517
1994-07-01	715
1994-10-01	333
1995-01-01	373
1995-04-01	534
1995-07-01	206
1995-10-01	249
1996-01-01	449
1996-04-01	295
1996-07-01	558
1996-10-01	460
1997-01-01	274
1997-04-01	360
1997-07-01	347
1997-10-01	335
1998-01-01	377
1998-04-01	638
1998-07-01	762
1998-10-01	1206
1999-01-01	1417
1999-04-01	1215
1999-07-01	951
1999-10-01	532
2000-01-01	524
2000-04-01	410
2000-07-01	555
2000-10-01	544
2001-01-01	409
2001-04-01	300
2001-07-01	540
2001-10-01	759
2002-01-01	827
2002-04-01	836
2002-07-01	445
2002-10-01	462
2003-01-01	334
2003-04-01	810
2003-07-01	1044
2003-10-01	822
2004-01-01	732
2004-04-01	287
2004-07-01	176
2004-10-01	150
2005-01-01	150
2005-04-01	175
2005-07-01	125
2005-10-01	125
2006-01-01	265
2006-04-01	391
2006-07-01	890
2006-10-01	1048
2007-01-01	1318
2007-04-01	1183
2007-07-01	637
2007-10-01	867
2008-01-01	1186
2008-04-01	1959
2008-07-01	2480
2008-10-01	2725
2009-01-01	3284
2009-04-01	3004
2009-07-01	3736
2009-10-01	3884
2010-01-01	5042
2010-04-01	6805
2010-07-01	6002
2010-10-01	6753
2011-01-01	7568
2011-04-01	7588
2011-07-01	9368
2011-10-01	11014
2012-01-01	8547
2012-04-01	6667
2012-07-01	4492
2012-10-01	1306
2013-01-01	530
2013-04-01	105
2013-07-01	1100
2013-10-01	3347
2014-01-01	4992
2014-04-01	5429
2014-07-01	4502
2014-10-01	2450
2015-01-01	2286
2015-04-01	2840
2015-07-01	2924
2015-10-01	3225
2016-01-01	1996
2016-04-01	1915
2016-07-01	2515
2016-10-01	2582
2017-01-01	3113
2017-04-01	3396
2017-07-01	2797
2017-10-01	2216
2018-01-01	1861
2018-04-01	1206