Quarter	Billions of US Dollars
1966-01-01	0.07
1966-04-01	0.10
1966-07-01	0.12
1966-10-01	0.12
1967-01-01	0.13
1967-04-01	0.23
1967-07-01	0.23
1967-10-01	0.26
1968-01-01	0.44
1968-04-01	0.79
1968-07-01	0.93
1968-10-01	1.00
1969-01-01	1.13
1969-04-01	1.15
1969-07-01	1.18
1969-10-01	1.33
1970-01-01	1.36
1970-04-01	1.36
1970-07-01	1.43
1970-10-01	1.45
1971-01-01	2.02
1971-04-01	2.16
1971-07-01	2.30
1971-10-01	2.69
1972-01-01	3.87
1972-04-01	5.44
1972-07-01	6.92
1972-10-01	8.68
1973-01-01	10.74
1973-04-01	12.62
1973-07-01	13.54
1973-10-01	14.25
1974-01-01	15.57
1974-04-01	16.70
1974-07-01	17.96
1974-10-01	20.86
1975-01-01	24.45
1975-04-01	28.27
1975-07-01	29.79
1975-10-01	34.79
1976-01-01	42.01
1976-04-01	47.39
1976-07-01	52.35
1976-10-01	58.80
1977-01-01	63.32
1977-04-01	69.60
1977-07-01	75.68
1977-10-01	84.17
1978-01-01	92.34
1978-04-01	98.89
1978-07-01	109.02
1978-10-01	113.26
1979-01-01	118.54
1979-04-01	124.47
1979-07-01	134.41
1979-10-01	137.99
1980-01-01	133.23
1980-04-01	147.08
1980-07-01	148.67
1980-10-01	148.47
1981-01-01	147.07
1981-04-01	145.81
1981-07-01	152.67
1981-10-01	165.77
1982-01-01	170.12
1982-04-01	173.24
1982-07-01	179.26
1982-10-01	192.63
1983-01-01	200.52
1983-04-01	206.07
1983-07-01	208.21
1983-10-01	217.51
1984-01-01	233.65
1984-04-01	236.30
1984-07-01	245.83
1984-10-01	264.12
1985-01-01	284.17
1985-04-01	304.93
1985-07-01	341.72
1985-10-01	367.95
1986-01-01	402.85
1986-04-01	451.36
1986-07-01	501.29
1986-10-01	531.83
1987-01-01	579.37
1987-04-01	603.75
1987-07-01	625.67
1987-10-01	685.92
1988-01-01	692.94
1988-04-01	698.67
1988-07-01	722.07
1988-10-01	767.96
1989-01-01	782.03
1989-04-01	805.38
1989-07-01	847.75
1989-10-01	896.87
1990-01-01	920.21
1990-04-01	951.61
1990-07-01	1022.44
1990-10-01	1061.58
1991-01-01	1043.04
1991-04-01	1059.26
1991-07-01	1130.54
1991-10-01	1205.73
1992-01-01	1181.30
1992-04-01	1257.80
1992-07-01	1301.04
1992-10-01	1251.70
1993-01-01	1288.52
1993-04-01	1319.56
1993-07-01	1355.88
1993-10-01	1353.16
1994-01-01	1437.37
1994-04-01	1498.00
1994-07-01	1574.80
1994-10-01	1597.29
1995-01-01	1729.77
1995-04-01	1781.91
1995-07-01	1770.69
1995-10-01	1793.72
1996-01-01	1835.48
1996-04-01	1873.46
1996-07-01	1941.12
1996-10-01	2005.31
1997-01-01	2004.93
1997-04-01	2090.72
1997-07-01	2138.04
1997-10-01	2122.31
1998-01-01	2195.06
1998-04-01	2301.05
1998-07-01	2444.98
1998-10-01	2533.59
1999-01-01	2587.05
1999-04-01	2747.29
1999-07-01	3003.86
1999-10-01	3053.75
2000-01-01	3121.80
2000-04-01	3284.84
2000-07-01	3343.03
2000-10-01	3600.90
2001-01-01	3803.35
2001-04-01	4027.22
2001-07-01	4333.77
2001-10-01	4506.02
2002-01-01	4697.80
2002-04-01	5255.14
2002-07-01	5325.26
2002-10-01	5631.15
2003-01-01	5931.49
2003-04-01	6335.34
2003-07-01	6683.32
2003-10-01	7322.95
2004-01-01	7538.18
2004-04-01	7729.47
2004-07-01	8049.70
2004-10-01	8855.64
2005-01-01	8907.32
2005-04-01	8882.32
2005-07-01	8991.87
2005-10-01	9273.07
2006-01-01	9763.48
2006-04-01	10503.00
2006-07-01	10851.78
2006-10-01	11718.82
2007-01-01	12322.25
2007-04-01	13142.68
2007-07-01	13776.69
2007-10-01	14325.23
2008-01-01	15159.44
2008-04-01	15820.11
2008-07-01	14931.96
2008-10-01	14856.53
2009-01-01	14734.81
2009-04-01	16080.09
2009-07-01	16694.15
2009-10-01	16784.90
2010-01-01	16277.61
2010-04-01	15408.27
2010-07-01	16710.26
2010-10-01	16575.00
2011-01-01	17326.62
2011-04-01	17604.76
2011-07-01	16784.04
2011-10-01	16381.16
2012-01-01	16826.01
2012-04-01	16103.65
2012-07-01	16448.50
2012-10-01	16633.71
2013-01-01	16195.65
2013-04-01	16293.87
2013-07-01	16699.30
2013-10-01	17015.70
2014-01-01	16978.45
2014-04-01	17066.04
2014-07-01	16257.67
2014-10-01	15811.00
2015-01-01	14884.87
2015-04-01	15405.66