Quarter	Millions of US Dollars
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	0
1989-07-01	0
1989-10-01	0
1990-01-01	0
1990-04-01	0
1990-07-01	0
1990-10-01	0
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	0
1993-07-01	71
1993-10-01	68
1994-01-01	58
1994-04-01	59
1994-07-01	47
1994-10-01	52
1995-01-01	56
1995-04-01	19
1995-07-01	24
1995-10-01	22
1996-01-01	15
1996-04-01	0
1996-07-01	0
1996-10-01	113
1997-01-01	151
1997-04-01	134
1997-07-01	222
1997-10-01	203
1998-01-01	207
1998-04-01	207
1998-07-01	0
1998-10-01	0
1999-01-01	0
1999-04-01	30
1999-07-01	152
1999-10-01	166
2000-01-01	274
2000-04-01	276
2000-07-01	146
2000-10-01	166
2001-01-01	69
2001-04-01	293
2001-07-01	265
2001-10-01	225
2002-01-01	225
2002-04-01	600
2002-07-01	1133
2002-10-01	1162
2003-01-01	1159
2003-04-01	565
2003-07-01	25
2003-10-01	99
2004-01-01	143
2004-04-01	262
2004-07-01	264
2004-10-01	268
2005-01-01	397
2005-04-01	275
2005-07-01	275
2005-10-01	150
2006-01-01	0
2006-04-01	0
2006-07-01	0
2006-10-01	0
2007-01-01	0
2007-04-01	405
2007-07-01	405
2007-10-01	641
2008-01-01	815
2008-04-01	410
2008-07-01	410
2008-10-01	173
2009-01-01	181
2009-04-01	181
2009-07-01	462
2009-10-01	462
2010-01-01	282
2010-04-01	283
2010-07-01	500
2010-10-01	500
2011-01-01	500
2011-04-01	674
2011-07-01	174
2011-10-01	349
2012-01-01	349
2012-04-01	925
2012-07-01	925
2012-10-01	804
2013-01-01	802
2013-04-01	2054
2013-07-01	2083
2013-10-01	2499
2014-01-01	2503
2014-04-01	457
2014-07-01	456
2014-10-01	4
2015-01-01	125
2015-04-01	498
2015-07-01	498
2015-10-01	778
2016-01-01	653
2016-04-01	280
2016-07-01	391
2016-10-01	250
2017-01-01	1575
2017-04-01	1575
2017-07-01	1464
2017-10-01	1725
2018-01-01	1525
2018-04-01	2145