Quarter	Billions of US Dollars
1966-01-01	0.02
1966-04-01	0.02
1966-07-01	0.02
1966-10-01	0.02
1967-01-01	0.02
1967-04-01	0.02
1967-07-01	0.02
1967-10-01	0.02
1968-01-01	0.13
1968-04-01	0.27
1968-07-01	0.34
1968-10-01	0.37
1969-01-01	0.46
1969-04-01	0.46
1969-07-01	0.46
1969-10-01	0.47
1970-01-01	0.47
1970-04-01	0.48
1970-07-01	0.48
1970-10-01	0.50
1971-01-01	0.74
1971-04-01	0.84
1971-07-01	0.95
1971-10-01	1.20
1972-01-01	1.57
1972-04-01	2.07
1972-07-01	2.17
1972-10-01	2.42
1973-01-01	2.61
1973-04-01	2.72
1973-07-01	2.88
1973-10-01	2.94
1974-01-01	3.05
1974-04-01	3.06
1974-07-01	3.06
1974-10-01	3.20
1975-01-01	3.26
1975-04-01	3.42
1975-07-01	3.37
1975-10-01	3.50
1976-01-01	3.77
1976-04-01	3.83
1976-07-01	4.13
1976-10-01	4.46
1977-01-01	5.12
1977-04-01	5.73
1977-07-01	6.31
1977-10-01	7.18
1978-01-01	7.60
1978-04-01	7.69
1978-07-01	8.43
1978-10-01	8.89
1979-01-01	9.50
1979-04-01	10.49
1979-07-01	11.00
1979-10-01	11.47
1980-01-01	11.44
1980-04-01	13.12
1980-07-01	14.33
1980-10-01	15.60
1981-01-01	16.64
1981-04-01	17.30
1981-07-01	18.95
1981-10-01	21.13
1982-01-01	25.09
1982-04-01	29.56
1982-07-01	33.22
1982-10-01	36.99
1983-01-01	39.55
1983-04-01	41.95
1983-07-01	43.55
1983-10-01	46.58
1984-01-01	50.71
1984-04-01	52.75
1984-07-01	54.30
1984-10-01	55.94
1985-01-01	56.86
1985-04-01	57.66
1985-07-01	60.01
1985-10-01	60.39
1986-01-01	61.78
1986-04-01	63.56
1986-07-01	65.60
1986-10-01	66.80
1987-01-01	69.39
1987-04-01	70.78
1987-07-01	71.35
1987-10-01	75.69
1988-01-01	74.95
1988-04-01	73.42
1988-07-01	74.64
1988-10-01	77.54
1989-01-01	78.43
1989-04-01	78.93
1989-07-01	81.87
1989-10-01	85.01
1990-01-01	86.50
1990-04-01	87.16
1990-07-01	96.14
1990-10-01	97.37
1991-01-01	95.86
1991-04-01	94.55
1991-07-01	98.44
1991-10-01	101.76
1992-01-01	94.51
1992-04-01	96.73
1992-07-01	103.23
1992-10-01	97.17
1993-01-01	95.80
1993-04-01	93.33
1993-07-01	101.17
1993-10-01	104.42
1994-01-01	110.65
1994-04-01	116.43
1994-07-01	124.21
1994-10-01	132.66
1995-01-01	145.67
1995-04-01	156.53
1995-07-01	161.17
1995-10-01	167.01
1996-01-01	175.09
1996-04-01	185.58
1996-07-01	198.01
1996-10-01	220.46
1997-01-01	232.84
1997-04-01	252.32
1997-07-01	276.44
1997-10-01	293.68
1998-01-01	306.37
1998-04-01	328.91
1998-07-01	349.67
1998-10-01	364.69
1999-01-01	371.27
1999-04-01	387.63
1999-07-01	422.83
1999-10-01	430.33
2000-01-01	439.21
2000-04-01	451.01
2000-07-01	458.31
2000-10-01	482.08
2001-01-01	493.98
2001-04-01	518.06
2001-07-01	554.46
2001-10-01	557.33
2002-01-01	563.51
2002-04-01	625.24
2002-07-01	620.20
2002-10-01	636.74
2003-01-01	645.64
2003-04-01	667.75
2003-07-01	685.51
2003-10-01	720.48
2004-01-01	718.74
2004-04-01	719.31
2004-07-01	728.40
2004-10-01	772.79
2005-01-01	760.49
2005-04-01	745.89
2005-07-01	753.04
2005-10-01	790.40
2006-01-01	843.77
2006-04-01	916.84
2006-07-01	995.23
2006-10-01	1134.39
2007-01-01	1229.39
2007-04-01	1350.12
2007-07-01	1437.97
2007-10-01	1477.18
2008-01-01	1520.12
2008-04-01	1519.45
2008-07-01	1488.99
2008-10-01	1474.68
2009-01-01	1446.73
2009-04-01	1475.60
2009-07-01	1492.22
2009-10-01	1486.16
2010-01-01	1469.04
2010-04-01	1447.75
2010-07-01	1501.77
2010-10-01	1516.09
2011-01-01	1528.03
2011-04-01	1546.83
2011-07-01	1531.71
2011-10-01	1533.14
2012-01-01	1570.40
2012-04-01	1581.26
2012-07-01	1623.32
2012-10-01	1660.21
2013-01-01	1664.41
2013-04-01	1709.96
2013-07-01	1724.78
2013-10-01	1750.73
2014-01-01	1781.14
2014-04-01	1837.45
2014-07-01	1862.54
2014-10-01	1875.33
2015-01-01	1890.55
2015-04-01	1942.08