Quarter	Millions of US Dollars
1994-07-01	254
1994-10-01	251
1995-01-01	287
1995-04-01	295
1995-07-01	253
1995-10-01	305
1996-01-01	296
1996-04-01	287
1996-07-01	282
1996-10-01	651
1997-01-01	635
1997-04-01	655
1997-07-01	640
1997-10-01	622
1998-01-01	817
1998-04-01	1658
1998-07-01	1799
1998-10-01	1864
1999-01-01	1789
1999-04-01	2170
1999-07-01	2195
1999-10-01	2277
2000-01-01	2198
2000-04-01	2820
2000-07-01	2838
2000-10-01	2879
2001-01-01	2760
2001-04-01	2782
2001-07-01	2854
2001-10-01	2596
2002-01-01	2578
2002-04-01	3018
2002-07-01	3003
2002-10-01	2891
2003-01-01	2981
2003-04-01	2783
2003-07-01	2743
2003-10-01	3272
2004-01-01	3178
2004-04-01	3771
2004-07-01	3844
2004-10-01	3935
2005-01-01	3756
2005-04-01	2611
2005-07-01	2599
2005-10-01	2555
2006-01-01	3828
2006-04-01	4007
2006-07-01	3844
2006-10-01	3811
2007-01-01	3863
2007-04-01	4995
2007-07-01	5242
2007-10-01	5445
2008-01-01	5858
2008-04-01	5866
2008-07-01	5321
2008-10-01	5180
2009-01-01	4953
2009-04-01	8087
2009-07-01	8378
2009-10-01	8243
2010-01-01	7712
2010-04-01	8248
2010-07-01	9174
2010-10-01	8982
2011-01-01	11325
2011-04-01	12967
2011-07-01	12115
2011-10-01	11609
2012-01-01	11983
2012-04-01	14819
2012-07-01	15135
2012-10-01	15384
2013-01-01	15013
2013-04-01	17486
2013-07-01	17962
2013-10-01	20828
2014-01-01	21405
2014-04-01	20931
2014-07-01	19546
2014-10-01	18203
2015-01-01	15129
2015-04-01	15600
2015-07-01	15533
2015-10-01	15191
2016-01-01	14330
2016-04-01	13840
2016-07-01	13912
2016-10-01	13311
2017-01-01	13460
2017-04-01	12979
2017-07-01	13276
2017-10-01	13395
2018-01-01	14069
2018-04-01	13135