Quarter	Millions of US Dollars
1999-10-01	60050
2000-01-01	54349
2000-04-01	54388
2000-07-01	50448
2000-10-01	53303
2001-01-01	52692
2001-04-01	50611
2001-07-01	56780
2001-10-01	55220
2002-01-01	56000
2002-04-01	65438
2002-07-01	64844
2002-10-01	79274
2003-01-01	81434
2003-04-01	84355
2003-07-01	89437
2003-10-01	97240
2004-01-01	98762
2004-04-01	102604
2004-07-01	106069
2004-10-01	116677
2005-01-01	114028
2005-04-01	106397
2005-07-01	105923
2005-10-01	105661
2006-01-01	110494
2006-04-01	112387
2006-07-01	109185
2006-10-01	111642
2007-01-01	111321
2007-04-01	106932
2007-07-01	112210
2007-10-01	116923
2008-01-01	129563
2008-04-01	125177
2008-07-01	115458
2008-10-01	121348
2009-01-01	107267
2009-04-01	113197
2009-07-01	118390
2009-10-01	113715
2010-01-01	112647
2010-04-01	114711
2010-07-01	116593
2010-10-01	123899
2011-01-01	127972
2011-04-01	134035
2011-07-01	126053
2011-10-01	123082
2012-01-01	135700
2012-04-01	121475
2012-07-01	123389
2012-10-01	131572
2013-01-01	124158
2013-04-01	125349
2013-07-01	134657
2013-10-01	134740
2014-01-01	137626
2014-04-01	139047
2014-07-01	132206
2014-10-01	127223
2015-01-01	131970
2015-04-01	132154
2015-07-01	125044
2015-10-01	125510
2016-01-01	127478
2016-04-01	123618
2016-07-01	125408
2016-10-01	118451
2017-01-01	122223
2017-04-01	122646
2017-07-01	121488
2017-10-01	122633
2018-01-01	119397