Quarter	Millions of US Dollars
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	0
1983-07-01	0
1983-10-01	20
1984-01-01	20
1984-04-01	20
1984-07-01	20
1984-10-01	0
1985-01-01	0
1985-04-01	0
1985-07-01	0
1985-10-01	180
1986-01-01	180
1986-04-01	180
1986-07-01	180
1986-10-01	0
1987-01-01	15
1987-04-01	15
1987-07-01	15
1987-10-01	15
1988-01-01	0
1988-04-01	0
1988-07-01	0
1988-10-01	0
1989-01-01	0
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	91
1992-04-01	98
1992-07-01	136
1992-10-01	123
1993-01-01	30
1993-04-01	30
1993-07-01	92
1993-10-01	136
1994-01-01	293
1994-04-01	429
1994-07-01	340
1994-10-01	288
1995-01-01	145
1995-04-01	0
1995-07-01	0
1995-10-01	0
1996-01-01	0
1996-04-01	0
1996-07-01	358
1996-10-01	644
1997-01-01	1013
1997-04-01	1094
1997-07-01	703
1997-10-01	386
1998-01-01	0
1998-04-01	288
1998-07-01	480
1998-10-01	747
1999-01-01	882
1999-04-01	538
1999-07-01	379
1999-10-01	346
2000-01-01	150
2000-04-01	150
2000-07-01	150
2000-10-01	140
2001-01-01	140
2001-04-01	140
2001-07-01	140
2001-10-01	0
2002-01-01	0
2002-04-01	0
2002-07-01	247
2002-10-01	253
2003-01-01	444
2003-04-01	450
2003-07-01	205
2003-10-01	279
2004-01-01	448
2004-04-01	443
2004-07-01	528
2004-10-01	516
2005-01-01	80
2005-04-01	77
2005-07-01	0
2005-10-01	0
2006-01-01	483
2006-04-01	1137
2006-07-01	1564
2006-10-01	1718
2007-01-01	548
2007-04-01	975
2007-07-01	560
2007-10-01	247
2008-01-01	1056
2008-04-01	1189
2008-07-01	1248
2008-10-01	1214
2009-01-01	534
2009-04-01	208
2009-07-01	42
2009-10-01	1424
2010-01-01	1294
2010-04-01	1178
2010-07-01	1720
2010-10-01	641
2011-01-01	721
2011-04-01	733
2011-07-01	675
2011-10-01	864
2012-01-01	1310
2012-04-01	1696
2012-07-01	1363
2012-10-01	933
2013-01-01	720
2013-04-01	441
2013-07-01	671
2013-10-01	685
2014-01-01	2096
2014-04-01	2265
2014-07-01	2159
2014-10-01	2332
2015-01-01	726
2015-04-01	448
2015-07-01	374
2015-10-01	150
2016-01-01	662
2016-04-01	872
2016-07-01	950
2016-10-01	1029
2017-01-01	562
2017-04-01	372
2017-07-01	148
2017-10-01	0
2018-01-01	0
2018-04-01	583