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	111
1993-10-01	111
1994-01-01	15
1994-04-01	15
1994-07-01	0
1994-10-01	0
1995-01-01	320
1995-04-01	320
1995-07-01	320
1995-10-01	320
1996-01-01	0
1996-04-01	0
1996-07-01	0
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	180
2000-07-01	180
2000-10-01	180
2001-01-01	180
2001-04-01	465
2001-07-01	9
2001-10-01	19
2002-01-01	91
2002-04-01	292
2002-07-01	323
2002-10-01	835
2003-01-01	770
2003-04-01	569
2003-07-01	1661
2003-10-01	568
2004-01-01	336
2004-04-01	584
2004-07-01	899
2004-10-01	1136
2005-01-01	1690
2005-04-01	1714
2005-07-01	1557
2005-10-01	1657
2006-01-01	1116
2006-04-01	816
2006-07-01	1104
2006-10-01	1054
2007-01-01	1546
2007-04-01	1711
2007-07-01	1434
2007-10-01	1184
2008-01-01	585
2008-04-01	1660
2008-07-01	1399
2008-10-01	1799
2009-01-01	1799
2009-04-01	559
2009-07-01	720
2009-10-01	320
2010-01-01	378
2010-04-01	576
2010-07-01	878
2010-10-01	898
2011-01-01	1881
2011-04-01	2181
2011-07-01	1590
2011-10-01	3338
2012-01-01	3796
2012-04-01	3605
2012-07-01	3183
2012-10-01	2150
2013-01-01	2296
2013-04-01	1947
2013-07-01	1960
2013-10-01	2349
2014-01-01	1327
2014-04-01	1627
2014-07-01	2129
2014-10-01	1796
2015-01-01	2324
2015-04-01	2396
2015-07-01	2220
2015-10-01	1970
2016-01-01	1594
2016-04-01	1879
2016-07-01	2649
2016-10-01	4813
2017-01-01	5644
2017-04-01	6044
2017-07-01	5542
2017-10-01	3240
2018-01-01	3020
2018-04-01	2378