Quarter	Billions of US Dollars
1987-01-01	36.07
1987-04-01	36.03
1987-07-01	36.06
1987-10-01	37.68
1988-01-01	36.18
1988-04-01	34.81
1988-07-01	34.71
1988-10-01	35.36
1989-01-01	34.98
1989-04-01	34.53
1989-07-01	36.03
1989-10-01	37.84
1990-01-01	37.94
1990-04-01	37.96
1990-07-01	41.29
1990-10-01	41.67
1991-01-01	39.69
1991-04-01	38.36
1991-07-01	40.50
1991-10-01	41.91
1992-01-01	38.37
1992-04-01	38.99
1992-07-01	41.18
1992-10-01	39.02
1993-01-01	40.28
1993-04-01	40.13
1993-07-01	45.12
1993-10-01	47.39
1994-01-01	49.91
1994-04-01	52.11
1994-07-01	53.52
1994-10-01	56.55
1995-01-01	59.42
1995-04-01	63.61
1995-07-01	64.88
1995-10-01	65.60
1996-01-01	71.19
1996-04-01	77.98
1996-07-01	82.78
1996-10-01	100.98
1997-01-01	106.65
1997-04-01	119.85
1997-07-01	135.71
1997-10-01	152.77
1998-01-01	159.42
1998-04-01	177.43
1998-07-01	192.56
1998-10-01	203.20
1999-01-01	210.09
1999-04-01	220.21
1999-07-01	246.52
1999-10-01	252.40
2000-01-01	257.32
2000-04-01	266.69
2000-07-01	273.94
2000-10-01	289.25
2001-01-01	297.89
2001-04-01	311.91
2001-07-01	336.16
2001-10-01	340.15
2002-01-01	343.45
2002-04-01	372.11
2002-07-01	375.70
2002-10-01	388.55
2003-01-01	387.64
2003-04-01	394.96
2003-07-01	409.75
2003-10-01	434.96
2004-01-01	439.53
2004-04-01	441.48
2004-07-01	442.38
2004-10-01	469.52
2005-01-01	467.81
2005-04-01	464.95
2005-07-01	478.05
2005-10-01	513.18
2006-01-01	563.73
2006-04-01	625.09
2006-07-01	695.53
2006-10-01	823.71
2007-01-01	930.65
2007-04-01	1043.31
2007-07-01	1109.59
2007-10-01	1139.48
2008-01-01	1155.01
2008-04-01	1157.15
2008-07-01	1143.06
2008-10-01	1134.10
2009-01-01	1110.12
2009-04-01	1131.72
2009-07-01	1148.18
2009-10-01	1150.88
2010-01-01	1144.73
2010-04-01	1131.78
2010-07-01	1168.50
2010-10-01	1181.56
2011-01-01	1194.81
2011-04-01	1202.87
2011-07-01	1198.32
2011-10-01	1202.05
2012-01-01	1222.73
2012-04-01	1240.25
2012-07-01	1265.05
2012-10-01	1288.27
2013-01-01	1294.12
2013-04-01	1332.13
2013-07-01	1343.15
2013-10-01	1370.37
2014-01-01	1395.26
2014-04-01	1445.07
2014-07-01	1467.02
2014-10-01	1489.68
2015-01-01	1509.13
2015-04-01	1550.50