Quarter	Millions of US Dollars
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	30
1980-07-01	30
1980-10-01	65
1981-01-01	65
1981-04-01	35
1981-07-01	43
1981-10-01	8
1982-01-01	8
1982-04-01	7
1982-07-01	0
1982-10-01	0
1983-01-01	0
1983-04-01	20
1983-07-01	20
1983-10-01	19
1984-01-01	20
1984-04-01	0
1984-07-01	0
1984-10-01	25
1985-01-01	39
1985-04-01	39
1985-07-01	40
1985-10-01	33
1986-01-01	18
1986-04-01	46
1986-07-01	48
1986-10-01	29
1987-01-01	30
1987-04-01	5
1987-07-01	3
1987-10-01	3
1988-01-01	30
1988-04-01	27
1988-07-01	54
1988-10-01	55
1989-01-01	25
1989-04-01	25
1994-04-01	20
1994-07-01	20
1994-10-01	20
1995-01-01	0
1995-04-01	0
1995-07-01	0
1995-10-01	0
1996-01-01	0
1996-04-01	20
1996-07-01	0
1996-10-01	0
1997-01-01	0
1997-04-01	0
1997-07-01	0
1997-10-01	534
1998-01-01	540
1998-04-01	690
1998-07-01	690
1998-10-01	206
1999-01-01	200
1999-04-01	114
1999-07-01	361
1999-10-01	1288
2000-01-01	1286
2000-04-01	1545
2000-07-01	1404
2000-10-01	450
2001-01-01	469
2001-04-01	177
2001-07-01	93
2001-10-01	1627
2002-01-01	1382
2002-04-01	2462
2002-07-01	2437
2002-10-01	1505
2003-01-01	1505
2003-04-01	393
2003-07-01	393
2003-10-01	0
2004-01-01	0
2004-04-01	0
2004-07-01	155
2004-10-01	170
2005-01-01	162
2005-04-01	151
2005-07-01	602
2005-10-01	590
2006-01-01	605
2006-04-01	636
2006-07-01	300
2006-10-01	345
2007-01-01	1122
2007-04-01	1326
2007-07-01	1038
2007-10-01	998
2008-01-01	3011
2008-04-01	3307
2008-07-01	3059
2008-10-01	3090
2009-01-01	1381
2009-04-01	1218
2009-07-01	1546
2009-10-01	2572
2010-01-01	3043
2010-04-01	2553
2010-07-01	2443
2010-10-01	1380
2011-01-01	1066
2011-04-01	2016
2011-07-01	3388
2011-10-01	3937
2012-01-01	8906
2012-04-01	7655
2012-07-01	6416
2012-10-01	4882
2013-01-01	3897
2013-04-01	5273
2013-07-01	6257
2013-10-01	6562
2014-01-01	2463
2014-04-01	2740
2014-07-01	2152
2014-10-01	3398
2015-01-01	7638
2015-04-01	6285
2015-07-01	7605
2015-10-01	5589
2016-01-01	5629
2016-04-01	6053
2016-07-01	4444
2016-10-01	4234
2017-01-01	1094
2017-04-01	3994
2017-07-01	3956
2017-10-01	4235
2018-01-01	7352
2018-04-01	3609