Quarter	Billions of US Dollars
1987-01-01	3.07
1987-04-01	3.63
1987-07-01	3.90
1987-10-01	5.17
1988-01-01	5.64
1988-04-01	6.90
1988-07-01	8.66
1988-10-01	10.62
1989-01-01	11.18
1989-04-01	11.16
1989-07-01	13.22
1989-10-01	15.48
1990-01-01	17.41
1990-04-01	19.64
1990-07-01	24.89
1990-10-01	28.57
1991-01-01	28.02
1991-04-01	30.23
1991-07-01	36.07
1991-10-01	40.04
1992-01-01	39.52
1992-04-01	44.37
1992-07-01	42.85
1992-10-01	37.85
1993-01-01	38.94
1993-04-01	42.19
1993-07-01	52.88
1993-10-01	58.16
1994-01-01	61.37
1994-04-01	67.17
1994-07-01	74.59
1994-10-01	74.08
1995-01-01	79.42
1995-04-01	82.26
1995-07-01	82.45
1995-10-01	84.97
1996-01-01	85.82
1996-04-01	88.99
1996-07-01	88.06
1996-10-01	100.30
1997-01-01	101.95
1997-04-01	106.08
1997-07-01	108.56
1997-10-01	113.98
1998-01-01	122.62
1998-04-01	130.75
1998-07-01	136.62
1998-10-01	137.78
1999-01-01	155.87
1999-04-01	175.54
1999-07-01	197.07
1999-10-01	195.26
2000-01-01	203.33
2000-04-01	214.66
2000-07-01	214.24
2000-10-01	229.80
2001-01-01	231.11
2001-04-01	239.27
2001-07-01	260.01
2001-10-01	274.70
2002-01-01	281.22
2002-04-01	325.29
2002-07-01	343.32
2002-10-01	371.06
2003-01-01	398.41
2003-04-01	441.51
2003-07-01	477.49
2003-10-01	542.86
2004-01-01	576.88
2004-04-01	603.47
2004-07-01	641.53
2004-10-01	717.20
2005-01-01	733.69
2005-04-01	730.15
2005-07-01	757.31
2005-10-01	797.31
2006-01-01	840.55
2006-04-01	922.36
2006-07-01	985.82
2006-10-01	1099.38
2007-01-01	1182.55
2007-04-01	1276.47
2007-07-01	1303.14
2007-10-01	1320.08
2008-01-01	1352.51
2008-04-01	1408.54
2008-07-01	1356.98
2008-10-01	1348.61
2009-01-01	1339.68
2009-04-01	1460.08
2009-07-01	1481.18
2009-10-01	1480.52
2010-01-01	1393.30
2010-04-01	1322.11
2010-07-01	1397.32
2010-10-01	1355.31
2011-01-01	1396.72
2011-04-01	1407.60
2011-07-01	1347.59
2011-10-01	1358.23
2012-01-01	1405.07
2012-04-01	1335.66
2012-07-01	1380.01
2012-10-01	1381.58
2013-01-01	1337.54
2013-04-01	1362.30
2013-07-01	1405.90
2013-10-01	1434.91
2014-01-01	1435.11
2014-04-01	1453.09
2014-07-01	1397.49
2014-10-01	1367.38
2015-01-01	1314.54
2015-04-01	1370.08