Quarter	Billions of US Dollars
1987-01-01	21.82
1987-04-01	23.55
1987-07-01	24.00
1987-10-01	25.80
1988-01-01	26.90
1988-04-01	27.62
1988-07-01	28.25
1988-10-01	31.85
1989-01-01	31.77
1989-04-01	34.01
1989-07-01	35.05
1989-10-01	38.34
1990-01-01	41.55
1990-04-01	43.57
1990-07-01	47.07
1990-10-01	49.62
1991-01-01	47.99
1991-04-01	47.70
1991-07-01	52.17
1991-10-01	56.74
1992-01-01	56.25
1992-04-01	60.24
1992-07-01	64.14
1992-10-01	58.48
1993-01-01	60.87
1993-04-01	61.22
1993-07-01	75.95
1993-10-01	74.61
1994-01-01	78.57
1994-04-01	82.54
1994-07-01	85.60
1994-10-01	85.13
1995-01-01	93.67
1995-04-01	99.71
1995-07-01	99.39
1995-10-01	101.49
1996-01-01	106.78
1996-04-01	109.64
1996-07-01	112.77
1996-10-01	114.37
1997-01-01	119.34
1997-04-01	124.96
1997-07-01	130.88
1997-10-01	132.69
1998-01-01	140.20
1998-04-01	153.35
1998-07-01	169.64
1998-10-01	170.99
1999-01-01	177.02
1999-04-01	200.68
1999-07-01	222.81
1999-10-01	227.04
2000-01-01	222.73
2000-04-01	227.75
2000-07-01	239.07
2000-10-01	265.72
2001-01-01	269.25
2001-04-01	280.66
2001-07-01	306.17
2001-10-01	318.38
2002-01-01	323.34
2002-04-01	376.31
2002-07-01	389.47
2002-10-01	419.61
2003-01-01	437.99
2003-04-01	467.51
2003-07-01	481.45
2003-10-01	540.39
2004-01-01	523.22
2004-04-01	530.25
2004-07-01	534.85
2004-10-01	592.51
2005-01-01	575.75
2005-04-01	548.36
2005-07-01	542.14
2005-10-01	566.91
2006-01-01	583.75
2006-04-01	642.23
2006-07-01	661.07
2006-10-01	728.26
2007-01-01	774.77
2007-04-01	819.84
2007-07-01	855.48
2007-10-01	897.35
2008-01-01	942.93
2008-04-01	994.90
2008-07-01	931.29
2008-10-01	932.65
2009-01-01	960.31
2009-04-01	1039.67
2009-07-01	1081.53
2009-10-01	1076.39
2010-01-01	1038.04
2010-04-01	956.29
2010-07-01	1071.25
2010-10-01	1056.15
2011-01-01	1111.86
2011-04-01	1131.53
2011-07-01	1071.22
2011-10-01	1069.27
2012-01-01	1122.72
2012-04-01	1067.80
2012-07-01	1109.18
2012-10-01	1149.92
2013-01-01	1132.93
2013-04-01	1165.58
2013-07-01	1206.47
2013-10-01	1204.47
2014-01-01	1240.49
2014-04-01	1237.01
2014-07-01	1153.80
2014-10-01	1135.17
2015-01-01	1029.38
2015-04-01	1080.42