Quarter	Billions of US Dollars
1967-04-01	0.03
1967-07-01	0.03
1967-10-01	0.03
1968-01-01	0.03
1968-04-01	0.06
1968-07-01	0.06
1968-10-01	0.08
1969-01-01	0.08
1969-04-01	0.08
1969-07-01	0.08
1969-10-01	0.13
1970-01-01	0.15
1970-04-01	0.15
1970-07-01	0.15
1970-10-01	0.15
1971-01-01	0.21
1971-04-01	0.22
1971-07-01	0.22
1971-10-01	0.22
1972-01-01	0.22
1972-04-01	0.22
1972-07-01	0.22
1972-10-01	0.27
1973-01-01	0.28
1973-04-01	0.29
1973-07-01	0.29
1973-10-01	0.28
1974-01-01	0.29
1974-04-01	0.29
1974-07-01	0.29
1974-10-01	0.29
1975-01-01	0.31
1975-04-01	0.31
1975-07-01	0.30
1975-10-01	0.31
1976-01-01	0.31
1976-04-01	0.31
1976-07-01	0.31
1976-10-01	0.32
1977-01-01	0.34
1977-04-01	0.43
1977-07-01	0.44
1977-10-01	0.53
1978-01-01	0.57
1978-04-01	0.68
1978-07-01	0.71
1978-10-01	0.71
1979-01-01	0.74
1979-04-01	0.79
1979-07-01	0.99
1979-10-01	1.03
1980-01-01	1.18
1980-04-01	1.57
1980-07-01	1.83
1980-10-01	1.94
1981-01-01	2.16
1981-04-01	2.15
1981-07-01	2.16
1981-10-01	2.72
1982-01-01	3.48
1982-04-01	3.53
1982-07-01	3.59
1982-10-01	4.35
1983-01-01	4.39
1983-04-01	4.43
1983-07-01	4.54
1983-10-01	5.30
1984-01-01	5.73
1984-04-01	5.65
1984-07-01	6.12
1984-10-01	7.19
1985-01-01	8.29
1985-04-01	9.93
1985-07-01	11.19
1985-10-01	12.11
1986-01-01	12.10
1986-04-01	13.62
1986-07-01	14.74
1986-10-01	14.88
1987-01-01	15.39
1987-04-01	15.67
1987-07-01	15.80
1987-10-01	20.52
1988-01-01	20.53
1988-04-01	20.40
1988-07-01	21.00
1988-10-01	21.34
1989-01-01	20.34
1989-04-01	20.11
1989-07-01	21.04
1989-10-01	21.27
1990-01-01	21.27
1990-04-01	24.33
1990-07-01	27.21
1990-10-01	28.48
1991-01-01	32.48
1991-04-01	31.56
1991-07-01	33.49
1991-10-01	35.73
1992-01-01	35.42
1992-04-01	38.51
1992-07-01	38.23
1992-10-01	34.72
1993-01-01	36.91
1993-04-01	38.58
1993-07-01	43.72
1993-10-01	42.67
1994-01-01	46.19
1994-04-01	46.83
1994-07-01	51.04
1994-10-01	53.62
1995-01-01	56.11
1995-04-01	63.11
1995-07-01	61.32
1995-10-01	60.95
1996-01-01	59.42
1996-04-01	61.63
1996-07-01	62.53
1996-10-01	62.54
1997-01-01	61.09
1997-04-01	64.44
1997-07-01	65.28
1997-10-01	63.18
1998-01-01	63.16
1998-04-01	66.76
1998-07-01	69.53
1998-10-01	75.91
1999-01-01	70.75
1999-04-01	77.66
1999-07-01	80.85
1999-10-01	91.40
2000-01-01	98.72
2000-04-01	111.46
2000-07-01	117.64
2000-10-01	130.86
2001-01-01	135.89
2001-04-01	141.68
2001-07-01	155.43
2001-10-01	170.20
2002-01-01	178.61
2002-04-01	202.79
2002-07-01	209.40
2002-10-01	236.51
2003-01-01	264.08
2003-04-01	282.11
2003-07-01	296.98
2003-10-01	336.74
2004-01-01	356.81
2004-04-01	385.49
2004-07-01	402.38
2004-10-01	464.23
2005-01-01	469.49
2005-04-01	470.89
2005-07-01	458.33
2005-10-01	476.59
2006-01-01	512.89
2006-04-01	557.30
2006-07-01	579.82
2006-10-01	627.71
2007-01-01	662.27
2007-04-01	721.42
2007-07-01	747.71
2007-10-01	782.03
2008-01-01	856.39
2008-04-01	889.42
2008-07-01	808.33
2008-10-01	863.01
2009-01-01	860.38
2009-04-01	927.17
2009-07-01	982.26
2009-10-01	1000.12
2010-01-01	938.86
2010-04-01	857.56
2010-07-01	978.00
2010-10-01	977.05
2011-01-01	1051.24
2011-04-01	1077.91
2011-07-01	1014.22
2011-10-01	981.18
2012-01-01	977.87
2012-04-01	901.27
2012-07-01	924.40
2012-10-01	935.27
2013-01-01	890.46
2013-04-01	909.32
2013-07-01	956.23
2013-10-01	992.97
2014-01-01	985.14
2014-04-01	981.40
2014-07-01	887.29
2014-10-01	859.98
2015-01-01	771.24
2015-04-01	798.54