Quarter	Millions of US Dollars
1993-10-01	6297
1994-01-01	3767
1994-04-01	3842
1994-07-01	4331
1994-10-01	8284
1995-01-01	8481
1995-04-01	8375
1995-07-01	6369
1995-10-01	6249
1996-01-01	6127
1996-04-01	5498
1996-07-01	5192
1996-10-01	4805
1997-01-01	4575
1997-04-01	5345
1997-07-01	4433
1997-10-01	4048
1998-01-01	3969
1998-04-01	7537
1998-07-01	8937
1998-10-01	14998
1999-01-01	17325
1999-04-01	19003
1999-07-01	17521
1999-10-01	20133
2000-01-01	18809
2000-04-01	18935
2000-07-01	19245
2000-10-01	19613
2001-01-01	19434
2001-04-01	19103
2001-07-01	20708
2001-10-01	21237
2002-01-01	22802
2002-04-01	24156
2002-07-01	30943
2002-10-01	32238
2003-01-01	31245
2003-04-01	32146
2003-07-01	34552
2003-10-01	34398
2004-01-01	34311
2004-04-01	33319
2004-07-01	37701
2004-10-01	39540
2005-01-01	39818
2005-04-01	38313
2005-07-01	39853
2005-10-01	40369
2006-01-01	44606
2006-04-01	47129
2006-07-01	49247
2006-10-01	51219
2007-01-01	59258
2007-04-01	59844
2007-07-01	59392
2007-10-01	64214
2008-01-01	62786
2008-04-01	60156
2008-07-01	59530
2008-10-01	56624
2009-01-01	62359
2009-04-01	66559
2009-07-01	71944
2009-10-01	71579
2010-01-01	77022
2010-04-01	79862
2010-07-01	86215
2010-10-01	87035
2011-01-01	84887
2011-04-01	83695
2011-07-01	90645
2011-10-01	83341
2012-01-01	90487
2012-04-01	96195
2012-07-01	100516
2012-10-01	101157
2013-01-01	107043
2013-04-01	104197
2013-07-01	107823
2013-10-01	104316
2014-01-01	107787
2014-04-01	107050
2014-07-01	107402
2014-10-01	105039
2015-01-01	111746
2015-04-01	107564
2015-07-01	102473
2015-10-01	108517
2016-01-01	121589
2016-04-01	120081
2016-07-01	126767
2016-10-01	114027
2017-01-01	124419
2017-04-01	124272
2017-07-01	131901
2017-10-01	135943
2018-01-01	143124