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	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	50
1981-10-01	50
1982-01-01	50
1982-04-01	100
1982-07-01	50
1982-10-01	160
1983-01-01	210
1983-04-01	168
1983-07-01	168
1983-10-01	73
1984-01-01	23
1984-04-01	150
1984-07-01	238
1984-10-01	518
1985-01-01	612
1985-04-01	540
1985-07-01	482
1985-10-01	260
1986-01-01	279
1986-04-01	343
1986-07-01	418
1986-10-01	432
1987-01-01	379
1987-04-01	308
1987-07-01	239
1987-10-01	232
1988-01-01	288
1988-04-01	327
1988-07-01	290
1988-10-01	280
1989-01-01	227
1989-04-01	211
1989-07-01	273
1989-10-01	206
1990-01-01	141
1990-04-01	62
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	0
1992-04-01	0
1992-07-01	0
1992-10-01	0
1993-01-01	0
1993-04-01	300
1993-07-01	300
1993-10-01	300
1994-01-01	300
1994-04-01	0
1994-07-01	0
1994-10-01	89
1995-01-01	89
1995-04-01	89
1995-07-01	194
1995-10-01	105
1996-01-01	105
1996-04-01	105
1996-07-01	0
1996-10-01	0
1997-01-01	0
1997-04-01	85
1997-07-01	100
1997-10-01	100
1998-01-01	100
1998-04-01	15
1998-07-01	0
1998-10-01	0
1999-01-01	0
1999-04-01	0
1999-07-01	0
1999-10-01	0
2000-01-01	0
2000-04-01	0
2000-07-01	0
2000-10-01	200
2001-01-01	200
2001-04-01	200
2001-07-01	300
2001-10-01	100
2002-01-01	100
2002-04-01	100
2002-07-01	0
2002-10-01	0
2003-01-01	0
2003-04-01	75
2003-07-01	160
2003-10-01	160
2004-01-01	510
2004-04-01	560
2004-07-01	755
2004-10-01	955
2005-01-01	605
2005-04-01	1188
2005-07-01	906
2005-10-01	1055
2006-01-01	1192
2006-04-01	483
2006-07-01	1032
2006-10-01	1413
2007-01-01	1294
2007-04-01	1301
2007-07-01	734
2007-10-01	9
2008-01-01	1144
2008-04-01	1137
2008-07-01	1079
2008-10-01	1663
2009-01-01	1103
2009-04-01	1100
2009-07-01	1275
2009-10-01	675
2010-01-01	320
2010-04-01	920
2010-07-01	745
2010-10-01	745
2011-01-01	724
2011-04-01	324
2011-07-01	724
2011-10-01	724
2012-01-01	1680
2012-04-01	2430
2012-07-01	2030
2012-10-01	5630
2013-01-01	2550
2013-04-01	1600
2013-07-01	1600
2013-10-01	500
2014-01-01	0
2014-04-01	0
2014-07-01	0
2014-10-01	911
2015-01-01	883
2015-04-01	919
2015-07-01	917
2015-10-01	2125
2016-01-01	2551
2016-04-01	2549
2016-07-01	2577
2016-10-01	526
2017-01-01	276
2017-04-01	1126
2017-07-01	1225
2017-10-01	1625
2018-01-01	3881
2018-04-01	2431