Quarter	Millions of US Dollars
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	34
1977-10-01	40
1978-01-01	43
1978-04-01	43
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	12
1983-10-01	13
1984-01-01	28
1984-04-01	54
1984-07-01	41
1984-10-01	41
1985-01-01	26
1985-04-01	0
1985-07-01	0
1985-10-01	30
1986-01-01	30
1986-04-01	30
1986-07-01	30
1986-10-01	0
1987-01-01	0
1987-04-01	75
1987-07-01	99
1987-10-01	100
1988-01-01	100
1988-04-01	24
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	60
1990-04-01	147
1990-07-01	202
1990-10-01	289
1991-01-01	328
1991-04-01	333
1991-07-01	317
1991-10-01	240
1992-01-01	120
1992-04-01	63
1992-07-01	33
1992-10-01	82
1993-01-01	85
1993-04-01	50
1993-07-01	249
1993-10-01	213
1994-01-01	579
1994-04-01	944
1994-07-01	803
1994-10-01	701
1995-01-01	594
1995-04-01	362
1995-07-01	379
1995-10-01	315
1996-01-01	432
1996-04-01	459
1996-07-01	441
1996-10-01	558
1997-01-01	478
1997-04-01	395
1997-07-01	397
1997-10-01	173
1998-01-01	383
1998-04-01	394
1998-07-01	401
1998-10-01	435
1999-01-01	803
1999-04-01	778
1999-07-01	561
1999-10-01	1089
2000-01-01	1126
2000-04-01	1233
2000-07-01	1382
2000-10-01	922
2001-01-01	484
2001-04-01	411
2001-07-01	725
2001-10-01	632
2002-01-01	628
2002-04-01	571
2002-07-01	263
2002-10-01	432
2003-01-01	432
2003-04-01	394
2003-07-01	1010
2003-10-01	1544
2004-01-01	1480
2004-04-01	1447
2004-07-01	750
2004-10-01	944
2005-01-01	944
2005-04-01	1244
2005-07-01	1545
2005-10-01	626
2006-01-01	626
2006-04-01	327
2006-07-01	77
2006-10-01	71
2007-01-01	96
2007-04-01	207
2007-07-01	196
2007-10-01	308
2008-01-01	1032
2008-04-01	961
2008-07-01	2126
2008-10-01	3469
2009-01-01	2219
2009-04-01	2248
2009-07-01	1089
2009-10-01	2042
2010-01-01	3543
2010-04-01	3476
2010-07-01	3508
2010-10-01	3116
2011-01-01	747
2011-04-01	918
2011-07-01	866
2011-10-01	427
2012-01-01	291
2012-04-01	448
2012-07-01	891
2012-10-01	784
2013-01-01	1423
2013-04-01	1519
2013-07-01	1220
2013-10-01	1273
2014-01-01	1105
2014-04-01	1369
2014-07-01	1227
2014-10-01	1727
2015-01-01	1500
2015-04-01	3873
2015-07-01	4640
2015-10-01	4172
2016-01-01	4382
2016-04-01	2490
2016-07-01	2500
2016-10-01	3293
2017-01-01	6591
2017-04-01	6728
2017-07-01	6434
2017-10-01	7759
2018-01-01	5729
2018-04-01	7392