Quarter	Millions of US Dollars
1995-01-01	91350
1995-04-01	97212
1995-07-01	95968
1995-10-01	95677
1996-01-01	96770
1996-04-01	97956
1996-07-01	105594
1996-10-01	105063
1997-01-01	99397
1997-04-01	99077
1997-07-01	98071
1997-10-01	97759
1998-01-01	87027
1998-04-01	93867
1998-07-01	99783
1998-10-01	104402
1999-01-01	103396
1999-04-01	101760
1999-07-01	103353
1999-10-01	93458
2000-01-01	91467
2000-04-01	93032
2000-07-01	85847
2000-10-01	91963
2001-01-01	96537
2001-04-01	94398
2001-07-01	102308
2001-10-01	96416
2002-01-01	100949
2002-04-01	120495
2002-07-01	121769
2002-10-01	129935
2003-01-01	144808
2003-04-01	157876
2003-07-01	163680
2003-10-01	178690
2004-01-01	182593
2004-04-01	191777
2004-07-01	201648
2004-10-01	223041
2005-01-01	219077
2005-04-01	215356
2005-07-01	220381
2005-10-01	219042
2006-01-01	232278
2006-04-01	251977
2006-07-01	252671
2006-10-01	265069
2007-01-01	281931
2007-04-01	290327
2007-07-01	310777
2007-10-01	328519
2008-01-01	396853
2008-04-01	406444
2008-07-01	379967
2008-10-01	382800
2009-01-01	393625
2009-04-01	437173
2009-07-01	461665
2009-10-01	454623
2010-01-01	446078
2010-04-01	404608
2010-07-01	459473
2010-10-01	480061
2011-01-01	511799
2011-04-01	523534
2011-07-01	483511
2011-10-01	474390
2012-01-01	327780
2012-04-01	281390
2012-07-01	282303
2012-10-01	236290
2013-01-01	218824
2013-04-01	213632
2013-07-01	215134
2013-10-01	219200
2014-01-01	216331
2014-04-01	193190
2014-07-01	171535
2014-10-01	166680
2015-01-01	146581
2015-04-01	162626
2015-07-01	151019
2015-10-01	139490
2016-01-01	126979
2016-04-01	110358
2016-07-01	97045
2016-10-01	89820
2017-01-01	89144
2017-04-01	92361
2017-07-01	90352
2017-10-01	94513
2018-01-01	103110