Quarter	Billions of US Dollars
1987-01-01	11.99
1987-04-01	13.08
1987-07-01	14.58
1987-10-01	16.05
1988-01-01	17.51
1988-04-01	17.43
1988-07-01	18.33
1988-10-01	20.98
1989-01-01	21.16
1989-04-01	20.66
1989-07-01	21.87
1989-10-01	23.23
1990-01-01	23.96
1990-04-01	24.78
1990-07-01	26.54
1990-10-01	27.60
1991-01-01	24.89
1991-04-01	24.20
1991-07-01	26.45
1991-10-01	29.52
1992-01-01	27.85
1992-04-01	30.96
1992-07-01	33.47
1992-10-01	31.99
1993-01-01	31.90
1993-04-01	33.64
1993-07-01	37.25
1993-10-01	41.94
1994-01-01	49.51
1994-04-01	53.49
1994-07-01	60.34
1994-10-01	68.05
1995-01-01	81.24
1995-04-01	89.59
1995-07-01	94.20
1995-10-01	101.63
1996-01-01	110.96
1996-04-01	117.58
1996-07-01	128.77
1996-10-01	142.84
1997-01-01	151.81
1997-04-01	163.34
1997-07-01	169.33
1997-10-01	171.09
1998-01-01	180.51
1998-04-01	191.26
1998-07-01	204.70
1998-10-01	206.50
1999-01-01	212.82
1999-04-01	222.47
1999-07-01	256.91
1999-10-01	271.66
2000-01-01	281.83
2000-04-01	311.58
2000-07-01	308.92
2000-10-01	336.53
2001-01-01	344.24
2001-04-01	351.06
2001-07-01	374.73
2001-10-01	371.03
2002-01-01	383.43
2002-04-01	432.27
2002-07-01	444.19
2002-10-01	472.50
2003-01-01	515.88
2003-04-01	545.78
2003-07-01	560.77
2003-10-01	629.03
2004-01-01	668.61
2004-04-01	689.03
2004-07-01	736.85
2004-10-01	814.66
2005-01-01	809.64
2005-04-01	800.58
2005-07-01	805.46
2005-10-01	791.44
2006-01-01	832.26
2006-04-01	881.45
2006-07-01	891.10
2006-10-01	936.04
2007-01-01	976.68
2007-04-01	1009.89
2007-07-01	1058.60
2007-10-01	1097.31
2008-01-01	1149.02
2008-04-01	1148.13
2008-07-01	1028.49
2008-10-01	970.86
2009-01-01	876.49
2009-04-01	904.90
2009-07-01	908.46
2009-10-01	873.20
2010-01-01	838.40
2010-04-01	785.24
2010-07-01	847.50
2010-10-01	817.05
2011-01-01	856.75
2011-04-01	856.38
2011-07-01	831.67
2011-10-01	816.78
2012-01-01	842.84
2012-04-01	824.87
2012-07-01	819.84
2012-10-01	815.63
2013-01-01	784.84
2013-04-01	780.16
2013-07-01	776.24
2013-10-01	762.74
2014-01-01	766.11
2014-04-01	769.14
2014-07-01	733.81
2014-10-01	709.71
2015-01-01	669.68
2015-04-01	665.44