Quarter	Millions of US Dollars
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	20
1979-07-01	20
1979-10-01	20
1980-01-01	20
1980-04-01	0
1980-07-01	0
1980-10-01	0
1981-01-01	15
1981-04-01	14
1981-07-01	39
1981-10-01	39
1982-01-01	55
1982-04-01	55
1982-07-01	30
1982-10-01	30
1983-01-01	20
1983-04-01	20
1983-07-01	20
1983-10-01	20
1984-01-01	0
1984-04-01	0
1984-07-01	0
1984-10-01	159
1985-01-01	179
1985-04-01	179
1985-07-01	181
1985-10-01	77
1986-01-01	59
1986-04-01	62
1986-07-01	89
1986-10-01	32
1987-01-01	112
1987-04-01	108
1987-07-01	82
1987-10-01	97
1988-01-01	1
1988-04-01	60
1988-07-01	131
1988-10-01	135
1989-01-01	132
1989-04-01	71
1989-07-01	78
1989-10-01	222
1990-01-01	222
1990-04-01	222
1990-07-01	138
1990-10-01	0
1991-01-01	103
1991-04-01	180
1991-07-01	183
1991-10-01	179
1992-01-01	114
1992-04-01	40
1992-07-01	42
1992-10-01	133
1993-01-01	197
1993-04-01	203
1993-07-01	206
1993-10-01	107
1994-01-01	0
1994-04-01	0
1994-07-01	0
1994-10-01	127
1995-01-01	138
1995-04-01	138
1995-07-01	135
1995-10-01	0
1996-01-01	162
1996-04-01	207
1996-07-01	138
1996-10-01	107
1997-01-01	0
1997-04-01	9
1997-07-01	84
1997-10-01	690
1998-01-01	689
1998-04-01	694
1998-07-01	619
1998-10-01	10
1999-01-01	10
1999-04-01	36
1999-07-01	35
1999-10-01	35
2000-01-01	35
2000-04-01	155
2000-07-01	197
2000-10-01	1002
2001-01-01	1529
2001-04-01	1383
2001-07-01	1664
2001-10-01	1261
2002-01-01	841
2002-04-01	843
2002-07-01	566
2002-10-01	165
2003-01-01	456
2003-04-01	478
2003-07-01	455
2003-10-01	455
2004-01-01	66
2004-04-01	41
2004-07-01	21
2004-10-01	41
2005-01-01	421
2005-04-01	1001
2005-07-01	1355
2005-10-01	1333
2006-01-01	979
2006-04-01	373
2006-07-01	14
2006-10-01	9
2007-01-01	9
2007-04-01	1087
2007-07-01	1087
2007-10-01	1087
2008-01-01	1087
2008-04-01	9
2008-07-01	9
2008-10-01	5
2009-01-01	5
2009-04-01	9
2009-07-01	9
2009-10-01	164
2010-01-01	586
2010-04-01	677
2010-07-01	707
2010-10-01	569
2011-01-01	281
2011-04-01	536
2011-07-01	723
2011-10-01	597
2012-01-01	458
2012-04-01	482
2012-07-01	195
2012-10-01	338
2013-01-01	343
2013-04-01	382
2013-07-01	359
2013-10-01	791
2014-01-01	2252
2014-04-01	2402
2014-07-01	2407
2014-10-01	1749
2015-01-01	571
2015-04-01	555
2015-07-01	637
2015-10-01	947
2016-01-01	614
2016-04-01	896
2016-07-01	1003
2016-10-01	988
2017-01-01	1049
2017-04-01	1445
2017-07-01	1376
2017-10-01	1458
2018-01-01	1396
2018-04-01	624