Quarter	Billions of US Dollars
1987-01-01	11.07
1987-04-01	11.37
1987-07-01	11.59
1987-10-01	12.54
1988-01-01	15.14
1988-04-01	15.65
1988-07-01	16.56
1988-10-01	17.38
1989-01-01	17.46
1989-04-01	17.04
1989-07-01	20.27
1989-10-01	22.11
1990-01-01	23.08
1990-04-01	23.64
1990-07-01	25.83
1990-10-01	30.03
1991-01-01	30.75
1991-04-01	32.02
1991-07-01	33.57
1991-10-01	36.50
1992-01-01	36.63
1992-04-01	38.96
1992-07-01	38.76
1992-10-01	36.55
1993-01-01	33.20
1993-04-01	35.56
1993-07-01	36.25
1993-10-01	37.89
1994-01-01	41.91
1994-04-01	44.59
1994-07-01	47.52
1994-10-01	48.15
1995-01-01	52.29
1995-04-01	52.97
1995-07-01	54.89
1995-10-01	56.31
1996-01-01	56.69
1996-04-01	58.20
1996-07-01	62.45
1996-10-01	69.11
1997-01-01	70.11
1997-04-01	75.81
1997-07-01	79.11
1997-10-01	80.06
1998-01-01	85.96
1998-04-01	87.03
1998-07-01	93.09
1998-10-01	93.39
1999-01-01	96.75
1999-04-01	100.82
1999-07-01	120.95
1999-10-01	125.04
2000-01-01	139.71
2000-04-01	143.19
2000-07-01	147.68
2000-10-01	159.25
2001-01-01	154.18
2001-04-01	157.26
2001-07-01	170.03
2001-10-01	172.76
2002-01-01	177.12
2002-04-01	199.78
2002-07-01	212.88
2002-10-01	226.98
2003-01-01	252.80
2003-04-01	283.80
2003-07-01	310.99
2003-10-01	351.31
2004-01-01	369.38
2004-04-01	387.46
2004-07-01	409.16
2004-10-01	461.60
2005-01-01	476.50
2005-04-01	486.24
2005-07-01	513.74
2005-10-01	524.18
2006-01-01	558.27
2006-04-01	592.64
2006-07-01	614.64
2006-10-01	688.86
2007-01-01	731.57
2007-04-01	787.93
2007-07-01	865.28
2007-10-01	919.16
2008-01-01	978.11
2008-04-01	1101.85
2008-07-01	1083.06
2008-10-01	1170.32
2009-01-01	1160.70
2009-04-01	1288.50
2009-07-01	1358.12
2009-10-01	1340.20
2010-01-01	1310.51
2010-04-01	1254.26
2010-07-01	1368.46
2010-10-01	1312.57
2011-01-01	1371.46
2011-04-01	1392.79
2011-07-01	1341.57
2011-10-01	1242.17
2012-01-01	1277.88
2012-04-01	1214.86
2012-07-01	1194.02
2012-10-01	1154.64
2013-01-01	1105.32
2013-04-01	1065.33
2013-07-01	1077.15
2013-10-01	1081.72
2014-01-01	1064.23
2014-04-01	1051.84
2014-07-01	990.92
2014-10-01	941.01
2015-01-01	871.56
2015-04-01	898.58