Quarter	Billions of US Dollars
1969-01-01	0.10
1969-04-01	0.11
1969-07-01	0.11
1969-10-01	0.11
1970-01-01	0.11
1970-04-01	0.11
1970-07-01	0.11
1970-10-01	0.11
1971-01-01	0.11
1971-04-01	0.11
1971-07-01	0.11
1971-10-01	0.17
1972-01-01	0.37
1972-04-01	0.37
1972-07-01	0.47
1972-10-01	0.47
1973-01-01	0.60
1973-04-01	0.69
1973-07-01	0.78
1973-10-01	0.73
1974-01-01	0.77
1974-04-01	0.86
1974-07-01	1.02
1974-10-01	1.37
1975-01-01	1.58
1975-04-01	1.95
1975-07-01	1.95
1975-10-01	2.04
1976-01-01	2.41
1976-04-01	2.72
1976-07-01	2.92
1976-10-01	3.06
1977-01-01	3.58
1977-04-01	3.84
1977-07-01	4.17
1977-10-01	5.01
1978-01-01	5.49
1978-04-01	5.56
1978-07-01	6.12
1978-10-01	6.24
1979-01-01	6.60
1979-04-01	6.72
1979-07-01	6.83
1979-10-01	6.67
1980-01-01	6.08
1980-04-01	6.97
1980-07-01	7.13
1980-10-01	7.09
1981-01-01	6.98
1981-04-01	6.53
1981-07-01	6.72
1981-10-01	7.18
1982-01-01	6.82
1982-04-01	6.84
1982-07-01	7.10
1982-10-01	7.77
1983-01-01	7.72
1983-04-01	7.61
1983-07-01	7.81
1983-10-01	7.90
1984-01-01	8.28
1984-04-01	8.00
1984-07-01	7.79
1984-10-01	8.14
1985-01-01	8.08
1985-04-01	8.37
1985-07-01	9.16
1985-10-01	9.66
1986-01-01	10.73
1986-04-01	11.41
1986-07-01	12.37
1986-10-01	13.55
1987-01-01	13.82
1987-04-01	14.19
1987-07-01	14.09
1987-10-01	15.21
1988-01-01	15.16
1988-04-01	15.33
1988-07-01	15.51
1988-10-01	16.68
1989-01-01	15.45
1989-04-01	16.72
1989-07-01	18.69
1989-10-01	20.60
1990-01-01	22.95
1990-04-01	24.12
1990-07-01	25.82
1990-10-01	27.55
1991-01-01	28.00
1991-04-01	27.91
1991-07-01	31.63
1991-10-01	35.51
1992-01-01	36.66
1992-04-01	40.35
1992-07-01	44.84
1992-10-01	44.09
1993-01-01	45.40
1993-04-01	49.44
1993-07-01	36.46
1993-10-01	37.12
1994-01-01	39.92
1994-04-01	43.06
1994-07-01	49.48
1994-10-01	52.17
1995-01-01	58.59
1995-04-01	61.34
1995-07-01	62.48
1995-10-01	64.17
1996-01-01	68.25
1996-04-01	73.82
1996-07-01	77.55
1996-10-01	81.57
1997-01-01	83.05
1997-04-01	85.96
1997-07-01	93.76
1997-10-01	95.70
1998-01-01	100.97
1998-04-01	107.52
1998-07-01	121.60
1998-10-01	128.61
1999-01-01	130.33
1999-04-01	139.53
1999-07-01	156.83
1999-10-01	157.75
2000-01-01	159.08
2000-04-01	172.32
2000-07-01	173.83
2000-10-01	213.65
2001-01-01	213.80
2001-04-01	223.47
2001-07-01	241.33
2001-10-01	252.78
2002-01-01	263.35
2002-04-01	301.82
2002-07-01	315.69
2002-10-01	339.71
2003-01-01	364.41
2003-04-01	403.85
2003-07-01	425.18
2003-10-01	477.95
2004-01-01	485.41
2004-04-01	498.51
2004-07-01	514.97
2004-10-01	577.99
2005-01-01	577.76
2005-04-01	571.31
2005-07-01	583.18
2005-10-01	611.68
2006-01-01	648.04
2006-04-01	701.04
2006-07-01	730.93
2006-10-01	795.34
2007-01-01	835.63
2007-04-01	876.24
2007-07-01	915.41
2007-10-01	952.42
2008-01-01	1021.31
2008-04-01	1069.79
2008-07-01	981.77
2008-10-01	977.60
2009-01-01	990.49
2009-04-01	1099.99
2009-07-01	1141.38
2009-10-01	1143.34
2010-01-01	1146.43
2010-04-01	1068.19
2010-07-01	1207.86
2010-10-01	1203.58
2011-01-01	1274.43
2011-04-01	1315.83
2011-07-01	1260.33
2011-10-01	1261.48
2012-01-01	1298.30
2012-04-01	1248.27
2012-07-01	1288.82
2012-10-01	1308.53
2013-01-01	1271.30
2013-04-01	1295.46
2013-07-01	1349.87
2013-10-01	1337.99
2014-01-01	1353.38
2014-04-01	1353.24
2014-07-01	1280.26
2014-10-01	1242.48
2015-01-01	1141.58
2015-04-01	1192.75