Quarter	Millions of US Dollars
1993-10-01	1515
1994-01-01	2261
1994-04-01	2664
1994-07-01	3132
1994-10-01	3213
1995-01-01	3267
1995-04-01	3223
1995-07-01	3064
1995-10-01	3053
1996-01-01	2840
1996-04-01	2941
1996-07-01	4077
1996-10-01	5969
1997-01-01	7059
1997-04-01	7655
1997-07-01	7990
1997-10-01	8691
1998-01-01	9099
1998-04-01	10013
1998-07-01	9982
1998-10-01	11244
1999-01-01	11203
1999-04-01	11679
1999-07-01	12770
1999-10-01	12970
2000-01-01	13432
2000-04-01	13546
2000-07-01	13909
2000-10-01	13838
2001-01-01	14246
2001-04-01	14554
2001-07-01	14892
2001-10-01	15966
2002-01-01	15728
2002-04-01	16253
2002-07-01	16335
2002-10-01	14771
2003-01-01	15145
2003-04-01	15286
2003-07-01	16299
2003-10-01	16379
2004-01-01	16702
2004-04-01	15500
2004-07-01	14256
2004-10-01	13775
2005-01-01	12495
2005-04-01	13491
2005-07-01	14493
2005-10-01	15512
2006-01-01	15950
2006-04-01	15994
2006-07-01	17087
2006-10-01	17819
2007-01-01	18210
2007-04-01	16854
2007-07-01	18026
2007-10-01	18983
2008-01-01	20228
2008-04-01	21859
2008-07-01	23244
2008-10-01	24113
2009-01-01	23997
2009-04-01	24362
2009-07-01	25784
2009-10-01	27093
2010-01-01	27954
2010-04-01	27882
2010-07-01	27690
2010-10-01	29058
2011-01-01	29181
2011-04-01	29999
2011-07-01	30704
2011-10-01	30854
2012-01-01	31685
2012-04-01	30423
2012-07-01	31646
2012-10-01	31475
2013-01-01	32402
2013-04-01	32695
2013-07-01	34671
2013-10-01	35871
2014-01-01	36946
2014-04-01	38061
2014-07-01	38549
2014-10-01	39626
2015-01-01	40796
2015-04-01	41294
2015-07-01	41545
2015-10-01	42263
2016-01-01	42397
2016-04-01	42403
2016-07-01	43594
2016-10-01	44620
2017-01-01	45349
2017-04-01	45016
2017-07-01	46082
2017-10-01	46953
2018-01-01	48574