Quarter	Billions of US Dollars
1966-01-01	0.09
1966-04-01	0.13
1966-07-01	0.16
1966-10-01	0.18
1967-01-01	0.22
1967-04-01	0.35
1967-07-01	0.37
1967-10-01	0.39
1968-01-01	0.69
1968-04-01	1.18
1968-07-01	1.39
1968-10-01	1.48
1969-01-01	1.71
1969-04-01	1.72
1969-07-01	1.76
1969-10-01	1.92
1970-01-01	1.98
1970-04-01	2.00
1970-07-01	2.28
1970-10-01	2.31
1971-01-01	3.25
1971-04-01	3.67
1971-07-01	3.98
1971-10-01	4.83
1972-01-01	7.82
1972-04-01	10.34
1972-07-01	12.67
1972-10-01	15.62
1973-01-01	18.99
1973-04-01	22.37
1973-07-01	23.83
1973-10-01	25.08
1974-01-01	27.38
1974-04-01	29.46
1974-07-01	31.01
1974-10-01	35.70
1975-01-01	40.60
1975-04-01	45.78
1975-07-01	47.66
1975-10-01	55.14
1976-01-01	65.16
1976-04-01	72.64
1976-07-01	81.25
1976-10-01	90.09
1977-01-01	97.13
1977-04-01	106.66
1977-07-01	117.26
1977-10-01	130.77
1978-01-01	143.59
1978-04-01	152.56
1978-07-01	170.25
1978-10-01	177.86
1979-01-01	183.82
1979-04-01	193.33
1979-07-01	208.31
1979-10-01	213.87
1980-01-01	205.78
1980-04-01	228.25
1980-07-01	231.90
1980-10-01	232.01
1981-01-01	230.17
1981-04-01	228.03
1981-07-01	239.10
1981-10-01	260.05
1982-01-01	267.18
1982-04-01	274.59
1982-07-01	285.95
1982-10-01	309.21
1983-01-01	320.59
1983-04-01	331.60
1983-07-01	337.47
1983-10-01	351.95
1984-01-01	376.55
1984-04-01	379.80
1984-07-01	390.04
1984-10-01	413.23
1985-01-01	438.31
1985-04-01	465.37
1985-07-01	516.53
1985-10-01	547.67
1986-01-01	595.74
1986-04-01	653.09
1986-07-01	712.90
1986-10-01	746.24
1987-01-01	808.73
1987-04-01	834.16
1987-07-01	857.87
1987-10-01	943.82
1988-01-01	948.29
1988-04-01	942.64
1988-07-01	965.67
1988-10-01	1024.79
1989-01-01	1036.64
1989-04-01	1056.92
1989-07-01	1112.88
1989-10-01	1174.81
1990-01-01	1238.02
1990-04-01	1280.89
1990-07-01	1376.68
1990-10-01	1446.79
1991-01-01	1418.88
1991-04-01	1437.11
1991-07-01	1531.20
1991-10-01	1636.78
1992-01-01	1606.08
1992-04-01	1708.95
1992-07-01	1774.54
1992-10-01	1706.29
1993-01-01	1757.64
1993-04-01	1815.15
1993-07-01	1878.23
1993-10-01	1895.25
1994-01-01	2010.96
1994-04-01	2134.51
1994-07-01	2239.78
1994-10-01	2284.83
1995-01-01	2463.87
1995-04-01	2540.69
1995-07-01	2534.07
1995-10-01	2566.31
1996-01-01	2624.46
1996-04-01	2689.55
1996-07-01	2790.45
1996-10-01	2900.59
1997-01-01	2923.15
1997-04-01	3068.39
1997-07-01	3155.97
1997-10-01	3156.47
1998-01-01	3268.87
1998-04-01	3426.67
1998-07-01	3626.42
1998-10-01	3731.71
1999-01-01	3785.67
1999-04-01	3975.83
1999-07-01	4292.03
1999-10-01	4348.07
2000-01-01	4435.79
2000-04-01	4617.18
2000-07-01	4700.46
2000-10-01	4992.51
2001-01-01	5196.92
2001-04-01	5441.23
2001-07-01	5815.19
2001-10-01	5973.83
2002-01-01	6182.33
2002-04-01	6849.96
2002-07-01	6921.91
2002-10-01	7263.10
2003-01-01	7590.59
2003-04-01	8054.65
2003-07-01	8443.19
2003-10-01	9151.52
2004-01-01	9389.09
2004-04-01	9592.12
2004-07-01	9939.16
2004-10-01	10845.86
2005-01-01	10887.34
2005-04-01	10818.99
2005-07-01	10957.73
2005-10-01	11282.76
2006-01-01	11868.68
2006-04-01	12694.54
2006-07-01	13137.28
2006-10-01	14206.74
2007-01-01	14937.35
2007-04-01	15940.30
2007-07-01	16708.76
2007-10-01	17334.07
2008-01-01	18266.31
2008-04-01	18959.19
2008-07-01	17980.32
2008-10-01	17850.21
2009-01-01	17709.00
2009-04-01	19230.73
2009-07-01	19943.93
2009-10-01	20059.68
2010-01-01	19569.26
2010-04-01	18690.72
2010-07-01	20179.08
2010-10-01	20093.11
2011-01-01	20993.08
2011-04-01	21389.08
2011-07-01	20561.90
2011-10-01	20187.27
2012-01-01	20926.91
2012-04-01	20238.65
2012-07-01	20769.12
2012-10-01	21088.15
2013-01-01	20662.48
2013-04-01	20905.55
2013-07-01	21447.41
2013-10-01	21894.98
2014-01-01	21988.04
2014-04-01	22212.61
2014-07-01	21397.28
2014-10-01	20967.34
2015-01-01	19980.56
2015-04-01	20666.74