Quarter	Billions of US Dollars
1987-01-01	10.19
1987-04-01	11.52
1987-07-01	12.23
1987-10-01	13.95
1988-01-01	15.38
1988-04-01	16.52
1988-07-01	18.06
1988-10-01	20.51
1989-01-01	21.06
1989-04-01	20.84
1989-07-01	23.51
1989-10-01	25.61
1990-01-01	27.18
1990-04-01	29.75
1990-07-01	35.26
1990-10-01	37.38
1991-01-01	36.49
1991-04-01	37.68
1991-07-01	43.81
1991-10-01	48.25
1992-01-01	48.18
1992-04-01	53.76
1992-07-01	52.23
1992-10-01	46.42
1993-01-01	46.62
1993-04-01	48.94
1993-07-01	53.34
1993-10-01	54.09
1994-01-01	56.85
1994-04-01	60.15
1994-07-01	63.86
1994-10-01	63.11
1995-01-01	65.79
1995-04-01	64.62
1995-07-01	64.65
1995-10-01	62.73
1996-01-01	63.25
1996-04-01	64.95
1996-07-01	64.13
1996-10-01	79.72
1997-01-01	82.34
1997-04-01	83.27
1997-07-01	84.07
1997-10-01	98.05
1998-01-01	105.33
1998-04-01	110.69
1998-07-01	113.27
1998-10-01	112.90
1999-01-01	126.61
1999-04-01	142.14
1999-07-01	159.65
1999-10-01	167.06
2000-01-01	173.27
2000-04-01	181.85
2000-07-01	182.17
2000-10-01	195.55
2001-01-01	202.59
2001-04-01	213.39
2001-07-01	239.07
2001-10-01	249.69
2002-01-01	256.77
2002-04-01	297.38
2002-07-01	312.37
2002-10-01	335.15
2003-01-01	358.36
2003-04-01	399.10
2003-07-01	419.21
2003-10-01	470.62
2004-01-01	510.58
2004-04-01	531.34
2004-07-01	560.88
2004-10-01	627.26
2005-01-01	644.46
2005-04-01	649.25
2005-07-01	666.59
2005-10-01	709.64
2006-01-01	748.55
2006-04-01	826.37
2006-07-01	884.60
2006-10-01	994.66
2007-01-01	1051.23
2007-04-01	1130.22
2007-07-01	1149.97
2007-10-01	1156.10
2008-01-01	1179.07
2008-04-01	1207.27
2008-07-01	1170.14
2008-10-01	1172.70
2009-01-01	1191.99
2009-04-01	1302.79
2009-07-01	1340.94
2009-10-01	1348.66
2010-01-01	1277.47
2010-04-01	1224.78
2010-07-01	1306.00
2010-10-01	1286.74
2011-01-01	1299.78
2011-04-01	1301.55
2011-07-01	1242.49
2011-10-01	1262.43
2012-01-01	1295.80
2012-04-01	1219.41
2012-07-01	1267.54
2012-10-01	1278.58
2013-01-01	1247.02
2013-04-01	1276.91
2013-07-01	1319.12
2013-10-01	1343.04
2014-01-01	1356.63
2014-04-01	1387.05
2014-07-01	1341.12
2014-10-01	1300.47
2015-01-01	1243.08
2015-04-01	1311.39