Quarter	Millions of US Dollars
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	0
1980-04-01	0
1980-07-01	0
1980-10-01	0
1981-01-01	0
1981-04-01	6
1981-07-01	6
1981-10-01	13
1982-01-01	12
1982-04-01	6
1982-07-01	6
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	31
1985-01-01	31
1985-04-01	31
1985-07-01	50
1985-10-01	22
1986-01-01	23
1986-04-01	27
1986-07-01	8
1986-10-01	10
1987-01-01	11
1987-04-01	9
1987-07-01	7
1987-10-01	0
1988-01-01	0
1988-04-01	5
1988-07-01	5
1988-10-01	5
1989-01-01	5
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	0
1991-01-01	0
1991-04-01	0
1991-07-01	0
1991-10-01	0
1992-01-01	0
1992-04-01	0
1992-07-01	0
1992-10-01	0
1993-01-01	0
1993-04-01	58
1993-07-01	59
1993-10-01	56
1994-01-01	58
1994-04-01	0
1994-07-01	0
1994-10-01	0
1995-01-01	0
1995-04-01	0
1995-07-01	0
1995-10-01	0
1996-01-01	0
1996-04-01	0
1996-07-01	0
1996-10-01	0
1997-01-01	0
1997-04-01	0
1997-07-01	11
1997-10-01	12
1998-01-01	61
1998-04-01	61
1998-07-01	263
1998-10-01	390
1999-01-01	315
1999-04-01	309
1999-07-01	212
1999-10-01	243
2000-01-01	231
2000-04-01	348
2000-07-01	240
2000-10-01	241
2001-01-01	337
2001-04-01	258
2001-07-01	512
2001-10-01	400
2002-01-01	292
2002-04-01	363
2002-07-01	153
2002-10-01	128
2003-01-01	132
2003-04-01	57
2003-07-01	0
2003-10-01	201
2004-01-01	195
2004-04-01	393
2004-07-01	399
2004-10-01	332
2005-01-01	326
2005-04-01	117
2005-07-01	116
2005-10-01	0
2006-01-01	0
2006-04-01	0
2006-07-01	0
2006-10-01	0
2007-01-01	0
2007-04-01	0
2007-07-01	51
2007-10-01	53
2008-01-01	60
2008-04-01	59
2008-07-01	0
2008-10-01	56
2009-01-01	115
2009-04-01	121
2009-07-01	419
2009-10-01	356
2010-01-01	337
2010-04-01	307
2010-07-01	68
2010-10-01	154
2011-01-01	92
2011-04-01	94
2011-07-01	5489
2011-10-01	5195
2012-01-01	5363
2012-04-01	5055
2012-07-01	20
2012-10-01	0
2013-01-01	50
2013-04-01	50
2013-07-01	304
2013-10-01	722
2014-01-01	676
2014-04-01	1005
2014-07-01	900
2014-10-01	579
2015-01-01	560
2015-04-01	513
2015-07-01	298
2015-10-01	385
2016-01-01	401
2016-04-01	170
2016-07-01	171
2016-10-01	153
2017-01-01	366
2017-04-01	313
2017-07-01	272
2017-10-01	512
2018-01-01	513
2018-04-01	494