Quarter	Billions of US Dollars
1987-01-01	171.12
1987-04-01	180.84
1987-07-01	189.18
1987-10-01	203.76
1988-01-01	210.78
1988-04-01	217.35
1988-07-01	226.05
1988-10-01	240.84
1989-01-01	252.72
1989-04-01	253.33
1989-07-01	270.77
1989-10-01	285.41
1990-01-01	297.30
1990-04-01	306.06
1990-07-01	334.80
1990-10-01	345.07
1991-01-01	341.39
1991-04-01	343.32
1991-07-01	361.39
1991-10-01	385.75
1992-01-01	375.81
1992-04-01	396.66
1992-07-01	415.11
1992-10-01	397.07
1993-01-01	388.83
1993-04-01	391.29
1993-07-01	423.74
1993-10-01	436.29
1994-01-01	469.11
1994-04-01	488.07
1994-07-01	522.43
1994-10-01	543.04
1995-01-01	596.80
1995-04-01	621.59
1995-07-01	635.49
1995-10-01	660.84
1996-01-01	687.29
1996-04-01	726.19
1996-07-01	767.31
1996-10-01	811.77
1997-01-01	832.97
1997-04-01	877.03
1997-07-01	921.11
1997-10-01	924.57
1998-01-01	966.28
1998-04-01	1005.11
1998-07-01	1083.51
1998-10-01	1110.06
1999-01-01	1147.38
1999-04-01	1199.85
1999-07-01	1331.97
1999-10-01	1362.17
2000-01-01	1414.50
2000-04-01	1495.71
2000-07-01	1500.67
2000-10-01	1603.84
2001-01-01	1656.70
2001-04-01	1696.45
2001-07-01	1795.59
2001-10-01	1800.63
2002-01-01	1843.82
2002-04-01	2084.61
2002-07-01	2093.84
2002-10-01	2201.17
2003-01-01	2363.27
2003-04-01	2535.10
2003-07-01	2659.06
2003-10-01	2971.67
2004-01-01	3134.37
2004-04-01	3208.29
2004-07-01	3415.65
2004-10-01	3821.17
2005-01-01	3926.43
2005-04-01	3940.43
2005-07-01	4044.61
2005-10-01	4152.84
2006-01-01	4488.53
2006-04-01	4818.97
2006-07-01	4995.96
2006-10-01	5427.08
2007-01-01	5825.20
2007-04-01	6235.74
2007-07-01	6635.15
2007-10-01	6942.08
2008-01-01	7504.30
2008-04-01	7898.17
2008-07-01	7390.40
2008-10-01	7127.72
2009-01-01	6829.45
2009-04-01	7332.74
2009-07-01	7610.50
2009-10-01	7512.73
2010-01-01	7352.59
2010-04-01	6869.53
2010-07-01	7509.51
2010-10-01	7347.06
2011-01-01	7767.75
2011-04-01	7883.33
2011-07-01	7448.80
2011-10-01	7122.69
2012-01-01	7351.31
2012-04-01	6959.89
2012-07-01	7003.39
2012-10-01	6934.57
2013-01-01	6655.67
2013-04-01	6614.56
2013-07-01	6724.50
2013-10-01	6813.77
2014-01-01	6756.70
2014-04-01	6748.64
2014-07-01	6409.78
2014-10-01	6165.24
2015-01-01	5797.36
2015-04-01	5925.31