Quarter	Billions of US Dollars
1968-07-01	0.04
1968-10-01	0.04
1969-01-01	0.04
1969-04-01	0.04
1969-07-01	0.04
1969-10-01	0.04
1970-01-01	0.04
1970-04-01	0.04
1970-07-01	0.04
1970-10-01	0.04
1971-01-01	0.10
1971-04-01	0.13
1971-07-01	0.15
1971-10-01	0.24
1972-01-01	0.44
1972-04-01	0.59
1972-07-01	0.80
1972-10-01	1.19
1973-01-01	1.40
1973-04-01	1.89
1973-07-01	2.03
1973-10-01	2.47
1974-01-01	2.70
1974-04-01	3.19
1974-07-01	3.22
1974-10-01	3.47
1975-01-01	3.84
1975-04-01	4.39
1975-07-01	4.44
1975-10-01	4.63
1976-01-01	4.86
1976-04-01	5.31
1976-07-01	6.03
1976-10-01	6.63
1977-01-01	7.27
1977-04-01	8.19
1977-07-01	9.57
1977-10-01	11.40
1978-01-01	13.41
1978-04-01	14.79
1978-07-01	16.38
1978-10-01	17.75
1979-01-01	18.48
1979-04-01	19.22
1979-07-01	20.54
1979-10-01	20.64
1980-01-01	19.53
1980-04-01	21.28
1980-07-01	21.73
1980-10-01	21.52
1981-01-01	21.02
1981-04-01	20.75
1981-07-01	21.51
1981-10-01	22.99
1982-01-01	23.18
1982-04-01	23.06
1982-07-01	22.64
1982-10-01	23.96
1983-01-01	23.38
1983-04-01	23.29
1983-07-01	24.46
1983-10-01	24.28
1984-01-01	24.88
1984-04-01	24.28
1984-07-01	23.93
1984-10-01	24.89
1985-01-01	25.93
1985-04-01	28.32
1985-07-01	30.71
1985-10-01	31.51
1986-01-01	33.87
1986-04-01	35.47
1986-07-01	36.84
1986-10-01	36.29
1987-01-01	38.15
1987-04-01	37.70
1987-07-01	37.57
1987-10-01	41.02
1988-01-01	40.73
1988-04-01	38.28
1988-07-01	38.16
1988-10-01	40.50
1989-01-01	39.54
1989-04-01	37.84
1989-07-01	40.80
1989-10-01	42.18
1990-01-01	77.39
1990-04-01	78.69
1990-07-01	82.01
1990-10-01	99.80
1991-01-01	98.93
1991-04-01	102.30
1991-07-01	106.18
1991-10-01	113.68
1992-01-01	116.09
1992-04-01	121.97
1992-07-01	128.47
1992-10-01	131.26
1993-01-01	136.91
1993-04-01	160.57
1993-07-01	173.11
1993-10-01	194.95
1994-01-01	210.23
1994-04-01	260.93
1994-07-01	275.08
1994-10-01	287.36
1995-01-01	299.26
1995-04-01	306.46
1995-07-01	312.19
1995-10-01	317.98
1996-01-01	328.90
1996-04-01	344.45
1996-07-01	363.50
1996-10-01	384.83
1997-01-01	404.35
1997-04-01	439.41
1997-07-01	464.18
1997-10-01	468.90
1998-01-01	478.31
1998-04-01	502.20
1998-07-01	515.34
1998-10-01	499.18
1999-01-01	497.11
1999-04-01	511.64
1999-07-01	521.35
1999-10-01	530.74
2000-01-01	547.47
2000-04-01	548.12
2000-07-01	576.57
2000-10-01	574.06
2001-01-01	577.87
2001-04-01	574.40
2001-07-01	585.19
2001-10-01	578.30
2002-01-01	586.10
2002-04-01	607.79
2002-07-01	610.08
2002-10-01	624.25
2003-01-01	630.11
2003-04-01	645.31
2003-07-01	665.45
2003-10-01	691.97
2004-01-01	713.41
2004-04-01	725.43
2004-07-01	741.08
2004-10-01	778.61
2005-01-01	798.76
2005-04-01	782.77
2005-07-01	797.97
2005-10-01	826.98
2006-01-01	869.45
2006-04-01	878.43
2006-07-01	903.98
2006-10-01	974.91
2007-01-01	1023.35
2007-04-01	1090.15
2007-07-01	1109.78
2007-10-01	1152.67
2008-01-01	1169.06
2008-04-01	1208.84
2008-07-01	1189.56
2008-10-01	1156.74
2009-01-01	1139.52
2009-04-01	1185.59
2009-07-01	1246.08
2009-10-01	1298.38
2010-01-01	1315.58
2010-04-01	1329.38
2010-07-01	1425.87
2010-10-01	1494.48
2011-01-01	1578.70
2011-04-01	1651.13
2011-07-01	1644.89
2011-10-01	1684.42
2012-01-01	1773.25
2012-04-01	1820.69
2012-07-01	1925.71
2012-10-01	2027.98
2013-01-01	2084.14
2013-04-01	2178.83
2013-07-01	2252.71
2013-10-01	2362.45
2014-01-01	2413.46
2014-04-01	2512.96
2014-07-01	2541.96
2014-10-01	2604.91
2015-01-01	2613.84
2015-04-01	2716.96