Quarter	Millions of US Dollars
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	0
1993-07-01	0
1993-10-01	0
1994-01-01	0
1994-04-01	0
1994-07-01	0
1994-10-01	0
1995-01-01	0
1995-04-01	0
1995-07-01	0
1995-10-01	0
1996-01-01	0
1996-04-01	0
1996-07-01	0
1996-10-01	0
1997-01-01	0
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	19
2000-04-01	19
2000-07-01	18
2000-10-01	19
2001-01-01	0
2001-04-01	0
2001-07-01	91
2001-10-01	88
2002-01-01	212
2002-04-01	270
2002-07-01	216
2002-10-01	288
2003-01-01	234
2003-04-01	219
2003-07-01	587
2003-10-01	1013
2004-01-01	1361
2004-04-01	1723
2004-07-01	1168
2004-10-01	1049
2005-01-01	909
2005-04-01	625
2005-07-01	1304
2005-10-01	1118
2006-01-01	1345
2006-04-01	1326
2006-07-01	425
2006-10-01	620
2007-01-01	405
2007-04-01	661
2007-07-01	979
2007-10-01	680
2008-01-01	709
2008-04-01	495
2008-07-01	243
2008-10-01	230
2009-01-01	303
2009-04-01	329
2009-07-01	370
2009-10-01	531
2010-01-01	417
2010-04-01	499
2010-07-01	449
2010-10-01	290
2011-01-01	199
2011-04-01	31
2011-07-01	160
2011-10-01	187
2012-01-01	79
2012-04-01	483
2012-07-01	493
2012-10-01	476
2013-01-01	464
2013-04-01	4
2013-07-01	4
2013-10-01	43
2014-01-01	154
2014-04-01	153
2014-07-01	469
2014-10-01	411
2015-01-01	296
2015-04-01	315
2015-07-01	0
2015-10-01	0
2016-01-01	36
2016-04-01	36
2016-07-01	236
2016-10-01	307
2017-01-01	272
2017-04-01	338
2017-07-01	143
2017-10-01	64
2018-01-01	66
2018-04-01	12