Quarter	Millions of US Dollars
1999-10-01	88345
2000-01-01	83938
2000-04-01	83201
2000-07-01	77654
2000-10-01	78969
2001-01-01	73703
2001-04-01	71074
2001-07-01	79249
2001-10-01	72550
2002-01-01	69304
2002-04-01	83405
2002-07-01	88011
2002-10-01	90342
2003-01-01	98584
2003-04-01	104708
2003-07-01	105692
2003-10-01	107096
2004-01-01	111303
2004-04-01	111815
2004-07-01	117346
2004-10-01	125872
2005-01-01	114417
2005-04-01	109691
2005-07-01	101083
2005-10-01	95414
2006-01-01	91807
2006-04-01	90876
2006-07-01	92114
2006-10-01	97687
2007-01-01	91743
2007-04-01	90493
2007-07-01	96334
2007-10-01	101558
2008-01-01	104299
2008-04-01	95238
2008-07-01	88798
2008-10-01	105371
2009-01-01	93690
2009-04-01	101549
2009-07-01	112630
2009-10-01	108135
2010-01-01	109221
2010-04-01	109644
2010-07-01	125936
2010-10-01	112607
2011-01-01	120451
2011-04-01	127662
2011-07-01	133016
2011-10-01	128634
2012-01-01	131571
2012-04-01	130889
2012-07-01	138313
2012-10-01	137541
2013-01-01	135732
2013-04-01	137131
2013-07-01	140694
2013-10-01	135272
2014-01-01	142795
2014-04-01	148365
2014-07-01	144118
2014-10-01	135663
2015-01-01	126350
2015-04-01	122021
2015-07-01	121411
2015-10-01	110608
2016-01-01	123264
2016-04-01	127058
2016-07-01	129974
2016-10-01	108101
2017-01-01	111504
2017-04-01	121671
2017-07-01	130215
2017-10-01	119303
2018-01-01	125014