Quarter	Billions of US Dollars
1993-07-01	14.516
1993-10-01	14.522
1994-01-01	15.117
1994-04-01	13.885
1994-07-01	15.554
1994-10-01	15.958
1995-01-01	19.425
1995-04-01	19.457
1995-07-01	18.556
1995-10-01	20.877
1996-01-01	18.641
1996-04-01	23.719
1996-07-01	20.216
1996-10-01	22.238
1997-01-01	20.512
1997-04-01	17.742
1997-07-01	18.221
1997-10-01	20.037
1998-01-01	25.492
1998-04-01	25.050
1998-07-01	28.952
1998-10-01	30.616
1999-01-01	22.120
1999-04-01	21.705
1999-07-01	22.380
1999-10-01	25.062
2000-01-01	28.264
2000-04-01	30.608
2000-07-01	30.588
2000-10-01	35.599
2001-01-01	37.951
2001-04-01	34.014
2001-07-01	38.139
2001-10-01	35.787
2002-01-01	34.907
2002-04-01	48.151
2002-07-01	42.398
2002-10-01	44.406
2003-01-01	47.758
2003-04-01	55.312
2003-07-01	66.070
2003-10-01	72.416
2004-01-01	79.905
2004-04-01	79.691
2004-07-01	87.778
2004-10-01	93.007
2005-01-01	93.843
2005-04-01	90.960
2005-07-01	101.580
2005-10-01	97.723
2006-01-01	105.970
2006-04-01	113.521
2006-07-01	108.750
2006-10-01	123.751
2007-01-01	124.291
2007-04-01	146.000
2007-07-01	139.906
2007-10-01	173.114
2008-01-01	210.662
2008-04-01	225.826
2008-07-01	214.953
2008-10-01	193.168
2009-01-01	176.943
2009-04-01	201.198
2009-07-01	195.869
2009-10-01	206.450
2010-01-01	217.390
2010-04-01	200.324
2010-07-01	235.010
2010-10-01	229.354
2011-01-01	271.954
2011-04-01	263.291
2011-07-01	241.923
2011-10-01	240.082
2012-01-01	253.471
2012-04-01	219.001
2012-07-01	235.665
2012-10-01	219.993
2013-01-01	223.901
2013-04-01	250.393
2013-07-01	256.051
2013-10-01	264.533
2014-01-01	257.608
2014-04-01	246.904
2014-07-01	246.683
2014-10-01	224.022
2015-01-01	221.515
2015-04-01	214.945