Quarter	Billions of US Dollars
1987-01-01	845.63
1987-04-01	875.86
1987-07-01	909.77
1987-10-01	994.02
1988-01-01	1007.39
1988-04-01	1005.74
1988-07-01	1034.57
1988-10-01	1091.49
1989-01-01	1108.04
1989-04-01	1127.32
1989-07-01	1186.67
1989-10-01	1244.44
1990-01-01	1315.42
1990-04-01	1362.25
1990-07-01	1468.63
1990-10-01	1536.11
1991-01-01	1520.50
1991-04-01	1540.06
1991-07-01	1636.70
1991-10-01	1743.21
1992-01-01	1721.24
1992-04-01	1827.97
1992-07-01	1895.77
1992-10-01	1822.06
1993-01-01	1859.53
1993-04-01	1919.66
1993-07-01	1991.50
1993-10-01	2010.91
1994-01-01	2132.45
1994-04-01	2259.79
1994-07-01	2367.49
1994-10-01	2405.96
1995-01-01	2583.08
1995-04-01	2666.04
1995-07-01	2668.17
1995-10-01	2708.70
1996-01-01	2772.56
1996-04-01	2859.89
1996-07-01	2952.29
1996-10-01	3071.94
1997-01-01	3099.70
1997-04-01	3250.80
1997-07-01	3348.75
1997-10-01	3347.59
1998-01-01	3466.91
1998-04-01	3622.44
1998-07-01	3842.10
1998-10-01	3954.53
1999-01-01	4033.95
1999-04-01	4230.23
1999-07-01	4590.19
1999-10-01	4665.44
2000-01-01	4772.70
2000-04-01	4997.47
2000-07-01	5095.06
2000-10-01	5436.80
2001-01-01	5633.39
2001-04-01	5845.38
2001-07-01	6195.02
2001-10-01	6339.40
2002-01-01	6539.86
2002-04-01	7238.61
2002-07-01	7326.94
2002-10-01	7671.98
2003-01-01	8053.69
2003-04-01	8532.78
2003-07-01	8899.23
2003-10-01	9672.77
2004-01-01	9934.11
2004-04-01	10138.83
2004-07-01	10517.34
2004-10-01	11473.16
2005-01-01	11534.55
2005-04-01	11458.14
2005-07-01	11605.01
2005-10-01	11904.92
2006-01-01	12569.01
2006-04-01	13452.87
2006-07-01	13919.52
2006-10-01	15040.30
2007-01-01	15905.48
2007-04-01	17005.17
2007-07-01	17792.34
2007-10-01	18408.72
2008-01-01	19508.84
2008-04-01	20247.80
2008-07-01	19159.19
2008-10-01	18873.41
2009-01-01	18659.73
2009-04-01	20157.28
2009-07-01	20911.07
2009-10-01	20896.33
2010-01-01	20424.32
2010-04-01	19459.54
2010-07-01	21029.04
2010-10-01	20878.24
2011-01-01	21841.64
2011-04-01	22234.51
2011-07-01	21398.46
2011-10-01	21001.11
2012-01-01	21870.79
2012-04-01	21127.17
2012-07-01	21625.45
2012-10-01	21928.91
2013-01-01	21496.73
2013-04-01	21759.60
2013-07-01	22343.45
2013-10-01	22764.92
2014-01-01	22858.32
2014-04-01	23131.10
2014-07-01	22313.26
2014-10-01	21850.83
2015-01-01	20868.78
2015-04-01	21551.11