Quarter	Millions of US Dollars
1968-07-01	0
1968-10-01	0
1969-01-01	0
1969-04-01	0
1969-07-01	0
1969-10-01	0
1970-01-01	0
1970-04-01	0
1970-07-01	0
1970-10-01	0
1971-01-01	0
1971-04-01	0
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	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	20
1983-07-01	20
1983-10-01	20
1984-01-01	20
1984-04-01	0
1984-07-01	0
1984-10-01	58
1985-01-01	58
1985-04-01	88
1985-07-01	89
1985-10-01	30
1986-01-01	30
1986-04-01	0
1986-07-01	24
1986-10-01	32
1987-01-01	47
1987-04-01	72
1987-07-01	52
1987-10-01	164
1988-01-01	147
1988-04-01	118
1988-07-01	111
1988-10-01	6
1989-01-01	28
1989-04-01	28
1989-07-01	28
1989-10-01	29
1990-01-01	6
1990-04-01	39
1990-07-01	78
1990-10-01	80
1991-01-01	402
1991-04-01	406
1991-07-01	388
1991-10-01	596
1992-01-01	619
1992-04-01	709
1992-07-01	843
1992-10-01	735
1993-01-01	543
1993-04-01	405
1993-07-01	539
1993-10-01	814
1994-01-01	610
1994-04-01	665
1994-07-01	877
1994-10-01	597
1995-01-01	645
1995-04-01	671
1995-07-01	438
1995-10-01	373
1996-01-01	571
1996-04-01	408
1996-07-01	573
1996-10-01	476
1997-01-01	379
1997-04-01	446
1997-07-01	432
1997-10-01	427
1998-01-01	385
1998-04-01	648
1998-07-01	772
1998-10-01	1206
1999-01-01	1417
1999-04-01	1215
1999-07-01	951
1999-10-01	532
2000-01-01	1103
2000-04-01	1108
2000-07-01	664
2000-10-01	660
2001-01-01	520
2001-04-01	300
2001-07-01	540
2001-10-01	1196
2002-01-01	1264
2002-04-01	1274
2002-07-01	883
2002-10-01	462
2003-01-01	334
2003-04-01	810
2003-07-01	1044
2003-10-01	936
2004-01-01	843
2004-04-01	397
2004-07-01	289
2004-10-01	422
2005-01-01	150
2005-04-01	175
2005-07-01	125
2005-10-01	125
2006-01-01	637
2006-04-01	1258
2006-07-01	2665
2006-10-01	2899
2007-01-01	2795
2007-04-01	2197
2007-07-01	677
2007-10-01	947
2008-01-01	2382
2008-04-01	3131
2008-07-01	3865
2008-10-01	4486
2009-01-01	5559
2009-04-01	6409
2009-07-01	6839
2009-10-01	7619
2010-01-01	7274
2010-04-01	8037
2010-07-01	7262
2010-10-01	7440
2011-01-01	8629
2011-04-01	8730
2011-07-01	10510
2011-10-01	11656
2012-01-01	10719
2012-04-01	9187
2012-07-01	6867
2012-10-01	3635
2013-01-01	2449
2013-04-01	2933
2013-07-01	4005
2013-10-01	7671
2014-01-01	9995
2014-04-01	8928
2014-07-01	10512
2014-10-01	9003
2015-01-01	8313
2015-04-01	10780
2015-07-01	10693
2015-10-01	12021
2016-01-01	9602
2016-04-01	8347
2016-07-01	11858
2016-10-01	9151
2017-01-01	11491
2017-04-01	13550
2017-07-01	8373
2017-10-01	10514
2018-01-01	10774
2018-04-01	10810