Quarter	Billions of US Dollars
1987-01-01	13.46
1987-04-01	13.94
1987-07-01	14.61
1987-10-01	16.42
1988-01-01	16.25
1988-04-01	16.71
1988-07-01	17.38
1988-10-01	18.98
1989-01-01	18.95
1989-04-01	20.79
1989-07-01	22.58
1989-10-01	24.94
1990-01-01	26.14
1990-04-01	27.56
1990-07-01	29.73
1990-10-01	30.25
1991-01-01	28.84
1991-04-01	28.31
1991-07-01	30.70
1991-10-01	35.20
1992-01-01	35.86
1992-04-01	39.48
1992-07-01	43.10
1992-10-01	41.01
1993-01-01	45.77
1993-04-01	50.22
1993-07-01	55.52
1993-10-01	55.94
1994-01-01	63.34
1994-04-01	68.70
1994-07-01	72.14
1994-10-01	74.23
1995-01-01	83.80
1995-04-01	90.79
1995-07-01	95.28
1995-10-01	101.15
1996-01-01	108.98
1996-04-01	115.92
1996-07-01	122.20
1996-10-01	126.19
1997-01-01	131.53
1997-04-01	136.85
1997-07-01	142.40
1997-10-01	144.37
1998-01-01	157.12
1998-04-01	166.39
1998-07-01	185.84
1998-10-01	192.20
1999-01-01	204.57
1999-04-01	213.24
1999-07-01	241.78
1999-10-01	235.80
2000-01-01	252.79
2000-04-01	267.70
2000-07-01	287.73
2000-10-01	307.35
2001-01-01	318.11
2001-04-01	320.65
2001-07-01	343.19
2001-10-01	347.18
2002-01-01	363.26
2002-04-01	421.18
2002-07-01	429.20
2002-10-01	453.59
2003-01-01	470.83
2003-04-01	497.43
2003-07-01	519.27
2003-10-01	563.72
2004-01-01	539.98
2004-04-01	551.51
2004-07-01	577.41
2004-10-01	629.92
2005-01-01	632.47
2005-04-01	616.37
2005-07-01	602.40
2005-10-01	619.27
2006-01-01	660.04
2006-04-01	710.93
2006-07-01	739.18
2006-10-01	795.21
2007-01-01	812.79
2007-04-01	861.89
2007-07-01	885.40
2007-10-01	920.36
2008-01-01	983.46
2008-04-01	998.07
2008-07-01	934.10
2008-10-01	946.51
2009-01-01	967.17
2009-04-01	1034.25
2009-07-01	1058.99
2009-10-01	1041.95
2010-01-01	994.68
2010-04-01	921.93
2010-07-01	987.90
2010-10-01	964.98
2011-01-01	993.12
2011-04-01	1013.76
2011-07-01	991.39
2011-10-01	986.79
2012-01-01	1028.66
2012-04-01	979.00
2012-07-01	982.73
2012-10-01	1004.31
2013-01-01	981.71
2013-04-01	987.75
2013-07-01	1005.01
2013-10-01	1007.60
2014-01-01	991.08
2014-04-01	1006.07
2014-07-01	947.16
2014-10-01	924.98
2015-01-01	860.63
2015-04-01	890.82