Quarter	Millions of US Dollars
1997-04-01	0
1997-07-01	0
1997-10-01	0
1998-01-01	0
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	0
2000-07-01	0
2000-10-01	0
2001-01-01	0
2001-04-01	260
2001-07-01	280
2001-10-01	270
2002-01-01	268
2002-04-01	0
2002-07-01	0
2002-10-01	157
2003-01-01	163
2003-04-01	171
2003-07-01	175
2003-10-01	0
2004-01-01	0
2004-04-01	0
2004-07-01	0
2004-10-01	409
2005-01-01	389
2005-04-01	363
2005-07-01	361
2005-10-01	0
2006-01-01	0
2006-04-01	0
2006-07-01	0
2006-10-01	0
2007-01-01	0
2007-04-01	810
2007-07-01	851
2007-10-01	883
2008-01-01	949
2008-04-01	0
2008-07-01	0
2008-10-01	0
2009-01-01	0
2009-04-01	0
2009-07-01	1025
2009-10-01	1008
2010-01-01	944
2010-04-01	859
2010-07-01	0
2010-10-01	0
2011-01-01	0
2011-04-01	1012
2011-07-01	945
2011-10-01	906
2012-01-01	935
2012-04-01	0
2012-07-01	0
2012-10-01	0
2013-01-01	0
2013-04-01	0
2013-07-01	0
2013-10-01	0
2014-01-01	1379
2014-04-01	2049
2014-07-01	1887
2014-10-01	1821
2015-01-01	538
2015-04-01	1678
2015-07-01	1680
2015-10-01	1633
2016-01-01	1708
2016-04-01	0
2016-07-01	0
2016-10-01	0
2017-01-01	0
2017-04-01	1712
2017-07-01	1771
2017-10-01	1799
2018-01-01	1848
2018-04-01	0