Quarter	Millions of US Dollars
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	25
1981-10-01	25
1982-01-01	25
1982-04-01	25
1982-07-01	0
1982-10-01	0
1983-01-01	0
1983-04-01	0
1983-07-01	0
1983-10-01	0
1984-01-01	0
1984-04-01	0
1984-07-01	35
1984-10-01	36
1985-01-01	61
1985-04-01	61
1985-07-01	89
1985-10-01	143
1986-01-01	122
1986-04-01	127
1986-07-01	59
1986-10-01	0
1987-01-01	0
1987-04-01	0
1987-07-01	0
1987-10-01	0
1988-01-01	0
1988-04-01	0
1988-07-01	0
1988-10-01	0
1989-01-01	0
1989-04-01	53
1989-07-01	53
1989-10-01	53
1990-01-01	117
1990-04-01	66
1990-07-01	72
1990-10-01	74
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	111
1993-07-01	196
1993-10-01	226
1994-01-01	185
1994-04-01	170
1994-07-01	170
1994-10-01	75
1995-01-01	320
1995-04-01	320
1995-07-01	320
1995-10-01	320
1996-01-01	16
1996-04-01	16
1996-07-01	16
1996-10-01	100
1997-01-01	100
1997-04-01	250
1997-07-01	250
1997-10-01	150
1998-01-01	150
1998-04-01	0
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	100
2000-07-01	100
2000-10-01	100
2001-01-01	100
2001-04-01	0
2001-07-01	110
2001-10-01	116
2002-01-01	187
2002-04-01	602
2002-07-01	773
2002-10-01	1285
2003-01-01	1220
2003-04-01	819
2003-07-01	1070
2003-10-01	568
2004-01-01	253
2004-04-01	502
2004-07-01	817
2004-10-01	853
2005-01-01	1450
2005-04-01	1174
2005-07-01	1017
2005-10-01	1017
2006-01-01	516
2006-04-01	516
2006-07-01	804
2006-10-01	1054
2007-01-01	1546
2007-04-01	1711
2007-07-01	1034
2007-10-01	784
2008-01-01	185
2008-04-01	860
2008-07-01	999
2008-10-01	999
2009-01-01	999
2009-04-01	159
2009-07-01	320
2009-10-01	320
2010-01-01	378
2010-04-01	576
2010-07-01	678
2010-10-01	698
2011-01-01	1681
2011-04-01	1481
2011-07-01	1090
2011-10-01	1903
2012-01-01	2361
2012-04-01	2655
2012-07-01	2142
2012-10-01	1800
2013-01-01	950
2013-04-01	750
2013-07-01	850
2013-10-01	967
2014-01-01	947
2014-04-01	1261
2014-07-01	1257
2014-10-01	754
2015-01-01	776
2015-04-01	823
2015-07-01	1163
2015-10-01	1120
2016-01-01	991
2016-04-01	815
2016-07-01	1274
2016-10-01	3531
2017-01-01	4587
2017-04-01	5181
2017-07-01	4992
2017-10-01	2990
2018-01-01	2770
2018-04-01	2026