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	0.08
1970-01-01	0.08
1970-04-01	0.08
1970-07-01	0.08
1970-10-01	0.08
1971-01-01	0.13
1971-04-01	0.14
1971-07-01	0.14
1971-10-01	0.14
1972-01-01	0.14
1972-04-01	0.14
1972-07-01	0.14
1972-10-01	0.23
1973-01-01	0.26
1973-04-01	0.27
1973-07-01	0.27
1973-10-01	0.26
1974-01-01	0.26
1974-04-01	0.31
1974-07-01	0.31
1974-10-01	0.35
1975-01-01	0.39
1975-04-01	0.42
1975-07-01	0.40
1975-10-01	0.43
1976-01-01	0.49
1976-04-01	0.63
1976-07-01	0.63
1976-10-01	0.66
1977-01-01	0.74
1977-04-01	0.95
1977-07-01	0.97
1977-10-01	1.12
1978-01-01	1.13
1978-04-01	1.22
1978-07-01	1.29
1978-10-01	1.31
1979-01-01	1.56
1979-04-01	1.76
1979-07-01	2.04
1979-10-01	2.05
1980-01-01	2.22
1980-04-01	2.64
1980-07-01	2.91
1980-10-01	2.98
1981-01-01	3.12
1981-04-01	3.02
1981-07-01	3.03
1981-10-01	3.58
1982-01-01	4.37
1982-04-01	4.48
1982-07-01	4.61
1982-10-01	5.44
1983-01-01	5.57
1983-04-01	5.74
1983-07-01	5.83
1983-10-01	6.86
1984-01-01	7.57
1984-04-01	7.47
1984-07-01	8.15
1984-10-01	9.59
1985-01-01	10.66
1985-04-01	12.36
1985-07-01	13.99
1985-10-01	15.06
1986-01-01	15.64
1986-04-01	17.45
1986-07-01	19.16
1986-10-01	20.05
1987-01-01	21.00
1987-04-01	21.55
1987-07-01	21.76
1987-10-01	27.39
1988-01-01	27.79
1988-04-01	28.13
1988-07-01	29.01
1988-10-01	30.27
1989-01-01	30.44
1989-04-01	30.16
1989-07-01	31.92
1989-10-01	33.27
1990-01-01	33.46
1990-04-01	36.70
1990-07-01	41.29
1990-10-01	43.18
1991-01-01	45.99
1991-04-01	45.40
1991-07-01	48.43
1991-10-01	51.82
1992-01-01	50.85
1992-04-01	56.58
1992-07-01	57.43
1992-10-01	52.15
1993-01-01	54.44
1993-04-01	56.19
1993-07-01	66.48
1993-10-01	65.97
1994-01-01	71.52
1994-04-01	73.45
1994-07-01	79.10
1994-10-01	84.07
1995-01-01	88.66
1995-04-01	96.54
1995-07-01	97.26
1995-10-01	96.04
1996-01-01	96.14
1996-04-01	100.54
1996-07-01	104.10
1996-10-01	107.59
1997-01-01	107.92
1997-04-01	115.37
1997-07-01	118.27
1997-10-01	117.23
1998-01-01	118.60
1998-04-01	127.54
1998-07-01	132.58
1998-10-01	140.62
1999-01-01	136.85
1999-04-01	160.04
1999-07-01	175.12
1999-10-01	182.01
2000-01-01	192.31
2000-04-01	208.53
2000-07-01	210.85
2000-10-01	232.53
2001-01-01	243.89
2001-04-01	256.80
2001-07-01	281.72
2001-10-01	297.26
2002-01-01	308.72
2002-04-01	341.49
2002-07-01	346.01
2002-10-01	377.60
2003-01-01	413.45
2003-04-01	436.29
2003-07-01	453.83
2003-10-01	510.32
2004-01-01	519.21
2004-04-01	546.30
2004-07-01	558.14
2004-10-01	633.13
2005-01-01	625.24
2005-04-01	622.64
2005-07-01	611.95
2005-10-01	624.97
2006-01-01	657.61
2006-04-01	709.15
2006-07-01	734.02
2006-10-01	786.30
2007-01-01	813.66
2007-04-01	875.48
2007-07-01	910.91
2007-10-01	952.56
2008-01-01	1036.92
2008-04-01	1070.01
2008-07-01	972.32
2008-10-01	1023.84
2009-01-01	1008.80
2009-04-01	1080.56
2009-07-01	1150.82
2009-10-01	1173.29
2010-01-01	1102.81
2010-04-01	1009.10
2010-07-01	1137.30
2010-10-01	1134.30
2011-01-01	1220.26
2011-04-01	1249.80
2011-07-01	1180.15
2011-10-01	1143.73
2012-01-01	1143.14
2012-04-01	1059.63
2012-07-01	1080.84
2012-10-01	1095.20
2013-01-01	1045.17
2013-04-01	1066.72
2013-07-01	1117.10
2013-10-01	1154.86
2014-01-01	1148.23
2014-04-01	1138.22
2014-07-01	1021.82
2014-10-01	986.74
2015-01-01	889.68
2015-04-01	921.82