Quarter	Billions of US Dollars
1970-10-01	0.02
1971-01-01	0.04
1971-04-01	0.04
1971-07-01	0.04
1971-10-01	0.15
1972-01-01	0.26
1972-04-01	0.40
1972-07-01	0.57
1972-10-01	0.73
1973-01-01	1.17
1973-04-01	1.61
1973-07-01	1.84
1973-10-01	1.94
1974-01-01	2.10
1974-04-01	2.17
1974-07-01	2.21
1974-10-01	2.42
1975-01-01	2.44
1975-04-01	2.66
1975-07-01	2.65
1975-10-01	2.75
1976-01-01	3.12
1976-04-01	3.45
1976-07-01	3.58
1976-10-01	3.82
1977-01-01	3.97
1977-04-01	4.27
1977-07-01	4.51
1977-10-01	4.89
1978-01-01	5.38
1978-04-01	5.78
1978-07-01	6.16
1978-10-01	6.19
1979-01-01	6.28
1979-04-01	6.45
1979-07-01	6.64
1979-10-01	6.80
1980-01-01	6.51
1980-04-01	6.77
1980-07-01	6.68
1980-10-01	6.37
1981-01-01	6.22
1981-04-01	5.89
1981-07-01	5.83
1981-10-01	5.76
1982-01-01	5.62
1982-04-01	5.45
1982-07-01	5.35
1982-10-01	5.53
1983-01-01	5.38
1983-04-01	5.24
1983-07-01	5.16
1983-10-01	5.09
1984-01-01	4.93
1984-04-01	4.81
1984-07-01	4.83
1984-10-01	5.04
1985-01-01	4.95
1985-04-01	5.07
1985-07-01	6.14
1985-10-01	10.21
1986-01-01	10.56
1986-04-01	11.88
1986-07-01	13.35
1986-10-01	14.29
1987-01-01	15.89
1987-04-01	17.11
1987-07-01	17.21
1987-10-01	20.04
1988-01-01	20.92
1988-04-01	22.51
1988-07-01	25.52
1988-10-01	26.45
1989-01-01	27.92
1989-04-01	27.25
1989-07-01	32.37
1989-10-01	37.65
1990-01-01	43.04
1990-04-01	47.57
1990-07-01	58.21
1990-10-01	66.46
1991-01-01	68.67
1991-04-01	73.12
1991-07-01	85.28
1991-10-01	95.81
1992-01-01	96.35
1992-04-01	109.23
1992-07-01	108.65
1992-10-01	106.93
1993-01-01	110.38
1993-04-01	121.27
1993-07-01	129.52
1993-10-01	134.40
1994-01-01	147.03
1994-04-01	157.89
1994-07-01	168.95
1994-10-01	173.32
1995-01-01	185.11
1995-04-01	192.48
1995-07-01	192.43
1995-10-01	198.37
1996-01-01	207.45
1996-04-01	218.40
1996-07-01	229.10
1996-10-01	256.90
1997-01-01	263.70
1997-04-01	283.16
1997-07-01	292.53
1997-10-01	300.07
1998-01-01	324.38
1998-04-01	340.98
1998-07-01	364.70
1998-10-01	372.68
1999-01-01	395.45
1999-04-01	431.17
1999-07-01	479.87
1999-10-01	494.32
2000-01-01	523.86
2000-04-01	546.30
2000-07-01	546.39
2000-10-01	584.20
2001-01-01	586.41
2001-04-01	606.72
2001-07-01	653.47
2001-10-01	664.52
2002-01-01	669.12
2002-04-01	760.87
2002-07-01	780.28
2002-10-01	835.76
2003-01-01	872.40
2003-04-01	944.35
2003-07-01	1019.74
2003-10-01	1144.06
2004-01-01	1214.45
2004-04-01	1269.14
2004-07-01	1344.92
2004-10-01	1524.43
2005-01-01	1561.67
2005-04-01	1560.51
2005-07-01	1621.62
2005-10-01	1699.66
2006-01-01	1806.12
2006-04-01	1940.11
2006-07-01	2046.27
2006-10-01	2226.30
2007-01-01	2381.82
2007-04-01	2574.89
2007-07-01	2729.39
2007-10-01	2818.42
2008-01-01	2929.61
2008-04-01	3155.32
2008-07-01	3082.56
2008-10-01	3115.34
2009-01-01	3097.80
2009-04-01	3417.38
2009-07-01	3494.41
2009-10-01	3491.50
2010-01-01	3345.92
2010-04-01	3208.20
2010-07-01	3445.61
2010-10-01	3357.42
2011-01-01	3487.50
2011-04-01	3550.60
2011-07-01	3404.94
2011-10-01	3313.94
2012-01-01	3436.19
2012-04-01	3293.93
2012-07-01	3319.83
2012-10-01	3284.48
2013-01-01	3170.54
2013-04-01	3145.40
2013-07-01	3211.22
2013-10-01	3253.80
2014-01-01	3243.19
2014-04-01	3264.72
2014-07-01	3145.66
2014-10-01	3043.72
2015-01-01	2883.82
2015-04-01	3005.69