Quarter	Billions of US Dollars
1968-04-01	0.02
1968-07-01	0.02
1968-10-01	0.02
1969-01-01	0.02
1969-04-01	0.02
1969-07-01	0.02
1969-10-01	0.02
1970-01-01	0.02
1970-04-01	0.02
1970-07-01	0.02
1970-10-01	0.02
1971-01-01	0.06
1971-04-01	0.10
1971-07-01	0.10
1971-10-01	0.10
1972-01-01	0.19
1972-04-01	0.30
1972-07-01	0.34
1972-10-01	0.39
1973-01-01	0.52
1973-04-01	0.64
1973-07-01	0.64
1973-10-01	0.62
1974-01-01	0.75
1974-04-01	0.78
1974-07-01	1.03
1974-10-01	1.24
1975-01-01	1.86
1975-04-01	2.35
1975-07-01	2.52
1975-10-01	3.04
1976-01-01	3.92
1976-04-01	4.83
1976-07-01	5.44
1976-10-01	6.12
1977-01-01	6.54
1977-04-01	6.92
1977-07-01	7.34
1977-10-01	8.52
1978-01-01	9.20
1978-04-01	9.67
1978-07-01	10.79
1978-10-01	10.80
1979-01-01	11.08
1979-04-01	11.73
1979-07-01	12.83
1979-10-01	13.27
1980-01-01	12.41
1980-04-01	13.79
1980-07-01	14.04
1980-10-01	14.50
1981-01-01	14.78
1981-04-01	14.44
1981-07-01	14.88
1981-10-01	15.84
1982-01-01	17.14
1982-04-01	18.45
1982-07-01	19.99
1982-10-01	22.11
1983-01-01	23.66
1983-04-01	25.20
1983-07-01	25.56
1983-10-01	26.88
1984-01-01	29.20
1984-04-01	29.31
1984-07-01	31.23
1984-10-01	32.16
1985-01-01	34.21
1985-04-01	35.02
1985-07-01	38.69
1985-10-01	39.35
1986-01-01	40.71
1986-04-01	44.19
1986-07-01	46.94
1986-10-01	48.66
1987-01-01	51.92
1987-04-01	53.36
1987-07-01	53.42
1987-10-01	58.27
1988-01-01	59.65
1988-04-01	60.95
1988-07-01	62.48
1988-10-01	67.13
1989-01-01	68.11
1989-04-01	68.31
1989-07-01	71.95
1989-10-01	74.85
1990-01-01	77.31
1990-04-01	80.76
1990-07-01	88.47
1990-10-01	91.85
1991-01-01	87.33
1991-04-01	88.51
1991-07-01	95.71
1991-10-01	106.52
1992-01-01	105.05
1992-04-01	112.68
1992-07-01	119.24
1992-10-01	114.25
1993-01-01	118.13
1993-04-01	118.09
1993-07-01	123.40
1993-10-01	123.51
1994-01-01	130.29
1994-04-01	135.28
1994-07-01	141.33
1994-10-01	143.63
1995-01-01	153.13
1995-04-01	155.20
1995-07-01	152.93
1995-10-01	154.78
1996-01-01	151.83
1996-04-01	152.29
1996-07-01	155.18
1996-10-01	155.62
1997-01-01	151.51
1997-04-01	150.87
1997-07-01	150.40
1997-10-01	149.61
1998-01-01	154.46
1998-04-01	162.07
1998-07-01	178.69
1998-10-01	186.25
1999-01-01	186.86
1999-04-01	197.23
1999-07-01	216.11
1999-10-01	220.62
2000-01-01	224.07
2000-04-01	236.50
2000-07-01	238.84
2000-10-01	262.02
2001-01-01	282.35
2001-04-01	290.84
2001-07-01	326.99
2001-10-01	342.45
2002-01-01	345.25
2002-04-01	405.74
2002-07-01	413.65
2002-10-01	451.02
2003-01-01	487.01
2003-04-01	545.48
2003-07-01	576.89
2003-10-01	646.40
2004-01-01	645.26
2004-04-01	669.87
2004-07-01	699.97
2004-10-01	801.92
2005-01-01	797.97
2005-04-01	799.07
2005-07-01	800.05
2005-10-01	829.44
2006-01-01	882.65
2006-04-01	957.95
2006-07-01	990.89
2006-10-01	1101.07
2007-01-01	1142.94
2007-04-01	1225.48
2007-07-01	1284.74
2007-10-01	1358.49
2008-01-01	1449.59
2008-04-01	1521.28
2008-07-01	1419.02
2008-10-01	1382.49
2009-01-01	1343.94
2009-04-01	1535.31
2009-07-01	1605.83
2009-10-01	1619.83
2010-01-01	1572.10
2010-04-01	1447.61
2010-07-01	1613.57
2010-10-01	1612.34
2011-01-01	1760.64
2011-04-01	1809.13
2011-07-01	1711.31
2011-10-01	1671.38
2012-01-01	1747.02
2012-04-01	1661.13
2012-07-01	1693.41
2012-10-01	1716.01
2013-01-01	1669.43
2013-04-01	1697.61
2013-07-01	1738.15
2013-10-01	1758.77
2014-01-01	1778.25
2014-04-01	1780.31
2014-07-01	1667.41
2014-10-01	1601.63
2015-01-01	1467.41
2015-04-01	1489.32