Quarter	Billions of US Dollars
1968-04-01	0.03
1968-07-01	0.03
1968-10-01	0.03
1969-01-01	0.09
1969-04-01	0.09
1969-07-01	0.09
1969-10-01	0.09
1970-01-01	0.09
1970-04-01	0.09
1970-07-01	0.09
1970-10-01	0.11
1971-01-01	0.21
1971-04-01	0.23
1971-07-01	0.25
1971-10-01	0.37
1972-01-01	0.49
1972-04-01	0.75
1972-07-01	1.02
1972-10-01	1.20
1973-01-01	1.68
1973-04-01	2.23
1973-07-01	2.49
1973-10-01	2.59
1974-01-01	2.73
1974-04-01	2.78
1974-07-01	2.85
1974-10-01	3.09
1975-01-01	3.15
1975-04-01	3.24
1975-07-01	3.25
1975-10-01	3.40
1976-01-01	3.76
1976-04-01	4.13
1976-07-01	4.30
1976-10-01	4.61
1977-01-01	4.85
1977-04-01	5.19
1977-07-01	5.67
1977-10-01	6.10
1978-01-01	6.47
1978-04-01	6.89
1978-07-01	7.42
1978-10-01	7.43
1979-01-01	7.53
1979-04-01	7.78
1979-07-01	8.03
1979-10-01	8.41
1980-01-01	8.22
1980-04-01	9.00
1980-07-01	9.34
1980-10-01	9.36
1981-01-01	9.19
1981-04-01	9.02
1981-07-01	9.32
1981-10-01	10.04
1982-01-01	9.87
1982-04-01	10.06
1982-07-01	10.38
1982-10-01	11.44
1983-01-01	11.94
1983-04-01	12.15
1983-07-01	12.11
1983-10-01	12.92
1984-01-01	14.35
1984-04-01	14.41
1984-07-01	14.76
1984-10-01	16.08
1985-01-01	16.67
1985-04-01	17.18
1985-07-01	18.84
1985-10-01	22.42
1986-01-01	23.41
1986-04-01	24.76
1986-07-01	26.65
1986-10-01	27.11
1987-01-01	28.56
1987-04-01	30.38
1987-07-01	30.63
1987-10-01	33.96
1988-01-01	35.64
1988-04-01	36.56
1988-07-01	39.32
1988-10-01	40.22
1989-01-01	41.38
1989-04-01	41.04
1989-07-01	45.47
1989-10-01	49.50
1990-01-01	52.80
1990-04-01	56.48
1990-07-01	64.89
1990-10-01	71.43
1991-01-01	73.75
1991-04-01	77.58
1991-07-01	89.16
1991-10-01	98.48
1992-01-01	99.94
1992-04-01	110.48
1992-07-01	109.63
1992-10-01	108.26
1993-01-01	110.36
1993-04-01	118.08
1993-07-01	118.05
1993-10-01	121.01
1994-01-01	128.31
1994-04-01	135.16
1994-07-01	141.94
1994-10-01	142.88
1995-01-01	149.87
1995-04-01	153.23
1995-07-01	152.54
1995-10-01	154.36
1996-01-01	155.06
1996-04-01	159.92
1996-07-01	165.74
1996-10-01	193.95
1997-01-01	196.59
1997-04-01	208.03
1997-07-01	210.19
1997-10-01	223.63
1998-01-01	244.40
1998-04-01	255.04
1998-07-01	266.14
1998-10-01	272.03
1999-01-01	288.90
1999-04-01	315.41
1999-07-01	352.86
1999-10-01	373.67
2000-01-01	396.37
2000-04-01	413.33
2000-07-01	418.69
2000-10-01	450.20
2001-01-01	453.79
2001-04-01	472.54
2001-07-01	512.26
2001-10-01	517.41
2002-01-01	526.47
2002-04-01	598.31
2002-07-01	616.73
2002-10-01	664.09
2003-01-01	703.01
2003-04-01	771.89
2003-07-01	823.58
2003-10-01	924.20
2004-01-01	977.61
2004-04-01	1016.03
2004-07-01	1055.33
2004-10-01	1177.45
2005-01-01	1211.85
2005-04-01	1217.05
2005-07-01	1245.26
2005-10-01	1311.77
2006-01-01	1387.83
2006-04-01	1510.27
2006-07-01	1593.43
2006-10-01	1765.68
2007-01-01	1856.21
2007-04-01	1995.64
2007-07-01	2106.15
2007-10-01	2169.93
2008-01-01	2233.45
2008-04-01	2400.03
2008-07-01	2353.23
2008-10-01	2421.87
2009-01-01	2472.05
2009-04-01	2747.68
2009-07-01	2838.10
2009-10-01	2872.31
2010-01-01	2752.27
2010-04-01	2661.01
2010-07-01	2862.31
2010-10-01	2815.95
2011-01-01	2896.91
2011-04-01	2935.15
2011-07-01	2825.04
2011-10-01	2761.18
2012-01-01	2838.01
2012-04-01	2705.90
2012-07-01	2754.23
2012-10-01	2748.06
2013-01-01	2665.96
2013-04-01	2669.17
2013-07-01	2745.43
2013-10-01	2783.76
2014-01-01	2764.09
2014-04-01	2790.13
2014-07-01	2682.67
2014-10-01	2587.56
2015-01-01	2440.71
2015-04-01	2555.52