Quarter	Millions of US Dollars
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	4
1997-04-01	4
1997-07-01	4
1997-10-01	104
1998-01-01	100
1998-04-01	100
1998-07-01	249
1998-10-01	249
1999-01-01	260
1999-04-01	310
1999-07-01	561
1999-10-01	461
2000-01-01	450
2000-04-01	900
2000-07-01	500
2000-10-01	630
2001-01-01	630
2001-04-01	573
2001-07-01	707
2001-10-01	723
2002-01-01	722
2002-04-01	921
2002-07-01	1246
2002-10-01	1171
2003-01-01	1991
2003-04-01	1449
2003-07-01	1372
2003-10-01	2201
2004-01-01	2595
2004-04-01	3787
2004-07-01	3811
2004-10-01	3045
2005-01-01	1719
2005-04-01	2503
2005-07-01	2980
2005-10-01	3379
2006-01-01	4438
2006-04-01	2387
2006-07-01	1780
2006-10-01	2229
2007-01-01	2448
2007-04-01	2548
2007-07-01	3108
2007-10-01	2179
2008-01-01	1310
2008-04-01	1165
2008-07-01	673
2008-10-01	2913
2009-01-01	3965
2009-04-01	3765
2009-07-01	3584
2009-10-01	2035
2010-01-01	970
2010-04-01	1870
2010-07-01	2450
2010-10-01	1750
2011-01-01	2350
2011-04-01	2103
2011-07-01	2106
2011-10-01	2377
2012-01-01	2673
2012-04-01	2875
2012-07-01	2075
2012-10-01	1775
2013-01-01	900
2013-04-01	2032
2013-07-01	2032
2013-10-01	2032
2014-01-01	2282
2014-04-01	2750
2014-07-01	3250
2014-10-01	3250
2015-01-01	3750
2015-04-01	2250
2015-07-01	1750
2015-10-01	2250
2016-01-01	3000
2016-04-01	2000
2016-07-01	2300
2016-10-01	7628
2017-01-01	6909
2017-04-01	7830
2017-07-01	7447
2017-10-01	4238
2018-01-01	3577
2018-04-01	3768