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	94.12
1993-10-01	95.23
1994-01-01	98.27
1994-04-01	100.83
1994-07-01	102.49
1994-10-01	95.45
1995-01-01	99.74
1995-04-01	104.66
1995-07-01	110.69
1995-10-01	114.38
1996-01-01	115.99
1996-04-01	135.56
1996-07-01	126.86
1996-10-01	132.55
1997-01-01	136.84
1997-04-01	143.99
1997-07-01	151.96
1997-10-01	152.54
1998-01-01	156.47
1998-04-01	153.45
1998-07-01	173.86
1998-10-01	182.32
1999-01-01	207.67
1999-04-01	212.39
1999-07-01	252.06
1999-10-01	267.53
2000-01-01	283.57
2000-04-01	324.58
2000-07-01	340.43
2000-10-01	389.64
2001-01-01	381.54
2001-04-01	357.44
2001-07-01	337.03
2001-10-01	322.38
2002-01-01	317.97
2002-04-01	345.49
2002-07-01	358.54
2002-10-01	361.75
2003-01-01	412.61
2003-04-01	434.06
2003-07-01	413.49
2003-10-01	472.44
2004-01-01	499.71
2004-04-01	506.45
2004-07-01	537.27
2004-10-01	579.41
2005-01-01	583.98
2005-04-01	580.23
2005-07-01	580.26
2005-10-01	559.55
2006-01-01	625.19
2006-04-01	677.63
2006-07-01	700.15
2006-10-01	743.97
2007-01-01	857.71
2007-04-01	941.07
2007-07-01	973.77
2007-10-01	968.82
2008-01-01	1151.50
2008-04-01	1208.82
2008-07-01	1103.13
2008-10-01	966.67
2009-01-01	908.78
2009-04-01	889.53
2009-07-01	926.58
2009-10-01	795.41
2010-01-01	812.61
2010-04-01	728.32
2010-07-01	809.92
2010-10-01	741.82
2011-01-01	790.34
2011-04-01	783.66
2011-07-01	759.84
2011-10-01	733.33
2012-01-01	857.46
2012-04-01	796.50
2012-07-01	765.49
2012-10-01	749.91
2013-01-01	743.88
2013-04-01	747.62
2013-07-01	782.74
2013-10-01	749.27
2014-01-01	750.04
2014-04-01	790.60
2014-07-01	781.37
2014-10-01	747.97
2015-01-01	745.72
2015-04-01	748.41