Quarter	Millions of US Dollars
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	42
1981-07-01	43
1981-10-01	44
1982-01-01	41
1982-04-01	0
1982-07-01	0
1982-10-01	0
1983-01-01	0
1983-04-01	0
1983-07-01	0
1983-10-01	0
1984-01-01	0
1984-04-01	0
1984-07-01	0
1984-10-01	110
1985-01-01	126
1985-04-01	126
1985-07-01	202
1985-10-01	466
1986-01-01	450
1986-04-01	450
1986-07-01	375
1986-10-01	21
1987-01-01	78
1987-04-01	77
1987-07-01	78
1987-10-01	67
1988-01-01	0
1988-04-01	0
1988-07-01	0
1988-10-01	0
1989-01-01	0
1989-04-01	0
1989-07-01	0
1989-10-01	0
1990-01-01	0
1990-04-01	0
1990-07-01	0
1990-10-01	36
1991-01-01	54
1991-04-01	251
1991-07-01	259
1991-10-01	310
1992-01-01	380
1992-04-01	222
1992-07-01	223
1992-10-01	216
1993-01-01	120
1993-04-01	66
1993-07-01	112
1993-10-01	47
1994-01-01	113
1994-04-01	65
1994-07-01	268
1994-10-01	113
1995-01-01	29
1995-04-01	33
1995-07-01	226
1995-10-01	409
1996-01-01	410
1996-04-01	391
1996-07-01	101
1996-10-01	184
1997-01-01	256
1997-04-01	284
1997-07-01	276
1997-10-01	29
1998-01-01	53
1998-04-01	42
1998-07-01	42
1998-10-01	73
1999-01-01	90
1999-04-01	136
1999-07-01	114
1999-10-01	147
2000-01-01	158
2000-04-01	138
2000-07-01	569
2000-10-01	290
2001-01-01	0
2001-04-01	311
2001-07-01	276
2001-10-01	387
2002-01-01	405
2002-04-01	329
2002-07-01	324
2002-10-01	142
2003-01-01	41
2003-04-01	0
2003-07-01	0
2003-10-01	81
2004-01-01	250
2004-04-01	224
2004-07-01	164
2004-10-01	406
2005-01-01	658
2005-04-01	603
2005-07-01	700
2005-10-01	626
2006-01-01	507
2006-04-01	1007
2006-07-01	1058
2006-10-01	909
2007-01-01	1145
2007-04-01	587
2007-07-01	456
2007-10-01	1659
2008-01-01	1779
2008-04-01	1091
2008-07-01	422
2008-10-01	202
2009-01-01	56
2009-04-01	482
2009-07-01	439
2009-10-01	582
2010-01-01	534
2010-04-01	270
2010-07-01	344
2010-10-01	549
2011-01-01	794
2011-04-01	182
2011-07-01	1721
2011-10-01	1631
2012-01-01	1557
2012-04-01	2073
2012-07-01	468
2012-10-01	784
2013-01-01	5017
2013-04-01	4934
2013-07-01	5091
2013-10-01	4928
2014-01-01	631
2014-04-01	703
2014-07-01	399
2014-10-01	293
2015-01-01	296
2015-04-01	90
2015-07-01	2592
2015-10-01	6326
2016-01-01	7593
2016-04-01	7593
2016-07-01	5090
2016-10-01	1336
2017-01-01	75
2017-04-01	75
2017-07-01	75
2017-10-01	75
2018-01-01	361
2018-04-01	340