Quarter	Millions of US Dollars
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	25
1979-07-01	26
1979-10-01	26
1980-01-01	24
1980-04-01	4
1980-07-01	4
1980-10-01	4
1981-01-01	4
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	30
1983-04-01	61
1983-07-01	60
1983-10-01	59
1984-01-01	31
1984-04-01	0
1984-07-01	33
1984-10-01	87
1985-01-01	88
1985-04-01	89
1985-07-01	60
1985-10-01	0
1986-01-01	0
1986-04-01	0
1986-07-01	0
1986-10-01	32
1987-01-01	34
1987-04-01	384
1987-07-01	395
1987-10-01	428
1988-01-01	522
1988-04-01	374
1988-07-01	473
1988-10-01	538
1989-01-01	418
1989-04-01	152
1989-07-01	49
1989-10-01	138
1990-01-01	130
1990-04-01	132
1990-07-01	145
1990-10-01	0
1991-01-01	107
1991-04-01	156
1991-07-01	164
1991-10-01	1265
1992-01-01	1080
1992-04-01	1086
1992-07-01	2351
1992-10-01	1498
1993-01-01	1505
1993-04-01	2154
1993-07-01	1345
1993-10-01	1606
1994-01-01	1635
1994-04-01	1437
1994-07-01	1034
1994-10-01	430
1995-01-01	489
1995-04-01	0
1995-07-01	0
1995-10-01	200
1996-01-01	430
1996-04-01	530
1996-07-01	625
1996-10-01	412
1997-01-01	654
1997-04-01	668
1997-07-01	723
1997-10-01	680
1998-01-01	226
1998-04-01	361
1998-07-01	340
1998-10-01	445
1999-01-01	385
1999-04-01	287
1999-07-01	356
1999-10-01	222
2000-01-01	228
2000-04-01	426
2000-07-01	324
2000-10-01	1000
2001-01-01	999
2001-04-01	1192
2001-07-01	1672
2001-10-01	1270
2002-01-01	1342
2002-04-01	1093
2002-07-01	1323
2002-10-01	3086
2003-01-01	2328
2003-04-01	2961
2003-07-01	3022
2003-10-01	2277
2004-01-01	2437
2004-04-01	1737
2004-07-01	1460
2004-10-01	1985
2005-01-01	1572
2005-04-01	1702
2005-07-01	1121
2005-10-01	1657
2006-01-01	1736
2006-04-01	3135
2006-07-01	4127
2006-10-01	2901
2007-01-01	2875
2007-04-01	1211
2007-07-01	237
2007-10-01	750
2008-01-01	1166
2008-04-01	4138
2008-07-01	5346
2008-10-01	5553
2009-01-01	4922
2009-04-01	2250
2009-07-01	944
2009-10-01	370
2010-01-01	470
2010-04-01	1830
2010-07-01	3580
2010-10-01	3690
2011-01-01	3590
2011-04-01	5120
2011-07-01	4320
2011-10-01	4210
2012-01-01	5559
2012-04-01	2561
2012-07-01	1620
2012-10-01	1336
2013-01-01	146
2013-04-01	646
2013-07-01	3915
2013-10-01	3999
2014-01-01	4741
2014-04-01	5842
2014-07-01	4720
2014-10-01	4820
2015-01-01	5308
2015-04-01	3927
2015-07-01	4128
2015-10-01	4289
2016-01-01	3797
2016-04-01	5453
2016-07-01	3952
2016-10-01	4173
2017-01-01	4110
2017-04-01	3218
2017-07-01	2703
2017-10-01	2976
2018-01-01	3311
2018-04-01	2986