Quarter	Millions of US Dollars
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	18
1980-04-01	19
1980-07-01	19
1980-10-01	18
1981-01-01	0
1981-04-01	0
1981-07-01	0
1981-10-01	0
1982-01-01	0
1982-04-01	22
1982-07-01	22
1982-10-01	22
1983-01-01	22
1983-04-01	0
1983-07-01	0
1983-10-01	0
1984-01-01	0
1984-04-01	30
1984-07-01	30
1984-10-01	38
1985-01-01	38
1985-04-01	8
1985-07-01	8
1985-10-01	8
1986-01-01	8
1986-04-01	17
1986-07-01	17
1986-10-01	9
1987-01-01	9
1996-04-01	139
1996-07-01	139
1996-10-01	8
1997-01-01	8
1997-04-01	8
1997-07-01	8
1997-10-01	8
1998-01-01	8
1998-04-01	8
1998-07-01	8
1998-10-01	8
1999-01-01	8
1999-04-01	8
1999-07-01	8
1999-10-01	8
2000-01-01	8
2000-04-01	8
2000-07-01	333
2000-10-01	333
2001-01-01	333
2001-04-01	333
2001-07-01	8
2001-10-01	18
2002-01-01	18
2002-04-01	8
2002-07-01	8
2002-10-01	8
2003-01-01	17
2003-04-01	251
2003-07-01	256
2003-10-01	274
2004-01-01	258
2004-04-01	616
2004-07-01	629
2004-10-01	689
2005-01-01	656
2005-04-01	8
2005-07-01	8
2005-10-01	12
2006-01-01	28
2006-04-01	25
2006-07-01	25
2006-10-01	18
2007-01-01	0
2007-04-01	0
2007-07-01	0
2007-10-01	0
2008-01-01	632
2008-04-01	631
2008-07-01	572
2008-10-01	668
2009-01-01	772
2009-04-01	820
2009-07-01	849
2009-10-01	720
2010-01-01	0
2010-04-01	552
2010-07-01	614
2010-10-01	601
2011-01-01	639
2011-04-01	0
2011-07-01	2701
2011-10-01	2588
2012-01-01	2671
2012-04-01	2518
2012-07-01	114
2012-10-01	116
2013-01-01	113
2013-04-01	115
2013-07-01	0
2013-10-01	69
2014-01-01	69
2014-04-01	1844
2014-07-01	1699
2014-10-01	1578
2015-01-01	1614
2015-04-01	224
2015-07-01	224
2015-10-01	544
2016-01-01	342
2016-04-01	333
2016-07-01	1004
2016-10-01	1687
2017-01-01	2780
2017-04-01	3967
2017-07-01	3715
2017-10-01	2559
2018-01-01	4102
2018-04-01	3324