Quarter	Billions of US Dollars
1987-01-01	33.18
1987-04-01	38.74
1987-07-01	47.54
1987-10-01	47.31
1988-01-01	54.46
1988-04-01	58.52
1988-07-01	64.76
1988-10-01	61.91
1989-01-01	66.32
1989-04-01	64.76
1989-07-01	69.05
1989-10-01	64.76
1990-01-01	71.52
1990-04-01	75.76
1990-07-01	86.55
1990-10-01	83.28
1991-01-01	94.49
1991-04-01	94.96
1991-07-01	97.08
1991-10-01	96.07
1992-01-01	103.18
1992-04-01	107.25
1992-07-01	108.92
1992-10-01	103.60
1993-01-01	88.20
1993-04-01	89.55
1993-07-01	98.26
1993-10-01	100.39
1994-01-01	104.32
1994-04-01	107.42
1994-07-01	108.74
1994-10-01	102.69
1995-01-01	107.64
1995-04-01	111.95
1995-07-01	118.06
1995-10-01	123.46
1996-01-01	127.12
1996-04-01	146.54
1996-07-01	139.80
1996-10-01	146.09
1997-01-01	150.83
1997-04-01	157.01
1997-07-01	167.35
1997-10-01	171.52
1998-01-01	176.87
1998-04-01	172.88
1998-07-01	195.05
1998-10-01	205.55
1999-01-01	230.67
1999-04-01	237.63
1999-07-01	282.00
1999-10-01	300.42
2000-01-01	320.35
2000-04-01	363.33
2000-07-01	377.56
2000-10-01	425.98
2001-01-01	420.62
2001-04-01	388.54
2001-07-01	369.65
2001-10-01	353.96
2002-01-01	347.73
2002-04-01	377.41
2002-07-01	391.56
2002-10-01	393.48
2003-01-01	445.01
2003-04-01	460.93
2003-07-01	439.12
2003-10-01	501.67
2004-01-01	527.51
2004-04-01	531.07
2004-07-01	559.47
2004-10-01	602.76
2005-01-01	617.25
2005-04-01	608.47
2005-07-01	616.50
2005-10-01	590.15
2006-01-01	661.78
2006-04-01	716.91
2006-07-01	739.87
2006-10-01	787.28
2007-01-01	904.81
2007-04-01	996.57
2007-07-01	1019.77
2007-10-01	1010.13
2008-01-01	1176.79
2008-04-01	1225.12
2008-07-01	1112.27
2008-10-01	968.30
2009-01-01	914.12
2009-04-01	897.09
2009-07-01	933.31
2009-10-01	800.36
2010-01-01	818.94
2010-04-01	731.57
2010-07-01	815.13
2010-10-01	747.84
2011-01-01	800.71
2011-04-01	794.54
2011-07-01	769.02
2011-10-01	739.26
2012-01-01	853.54
2012-04-01	792.58
2012-07-01	761.52
2012-10-01	730.30
2013-01-01	722.95
2013-04-01	728.65
2013-07-01	758.50
2013-10-01	723.78
2014-01-01	710.75
2014-04-01	745.53
2014-07-01	735.75
2014-10-01	702.76
2015-01-01	704.32
2015-04-01	706.10