Quarter	Millions of US Dollars
1999-10-01	93221
2000-01-01	88715
2000-04-01	87808
2000-07-01	81461
2000-10-01	83510
2001-01-01	78617
2001-04-01	75942
2001-07-01	85536
2001-10-01	78306
2002-01-01	76356
2002-04-01	90471
2002-07-01	95178
2002-10-01	99196
2003-01-01	108585
2003-04-01	115548
2003-07-01	117046
2003-10-01	118436
2004-01-01	122148
2004-04-01	121508
2004-07-01	127909
2004-10-01	143954
2005-01-01	126566
2005-04-01	121045
2005-07-01	111798
2005-10-01	104909
2006-01-01	99572
2006-04-01	99249
2006-07-01	100953
2006-10-01	104174
2007-01-01	98578
2007-04-01	92392
2007-07-01	96339
2007-10-01	102045
2008-01-01	105603
2008-04-01	97547
2008-07-01	91466
2008-10-01	105377
2009-01-01	93696
2009-04-01	101555
2009-07-01	112637
2009-10-01	108141
2010-01-01	110347
2010-04-01	112856
2010-07-01	129953
2010-10-01	117645
2011-01-01	125485
2011-04-01	134377
2011-07-01	142641
2011-10-01	137372
2012-01-01	137720
2012-04-01	139401
2012-07-01	147195
2012-10-01	146557
2013-01-01	141389
2013-04-01	141597
2013-07-01	147022
2013-10-01	142225
2014-01-01	148703
2014-04-01	151198
2014-07-01	147706
2014-10-01	140523
2015-01-01	128654
2015-04-01	122652
2015-07-01	123532
2015-10-01	115040
2016-01-01	126832
2016-04-01	132142
2016-07-01	134648
2016-10-01	112488
2017-01-01	114623
2017-04-01	124548
2017-07-01	133243
2017-10-01	125080
2018-01-01	129681