Quarter	Billions of US Dollars
1977-01-01	0.042
1977-04-01	0.043
1977-07-01	0.043
1977-10-01	0.048
1978-01-01	0.049
1978-04-01	0.048
1978-07-01	0.052
1978-10-01	0.055
1979-01-01	0.054
1979-04-01	0.054
1979-07-01	0.057
1979-10-01	0.058
1980-01-01	0.051
1980-04-01	0.057
1980-07-01	0.055
1980-10-01	0.051
1981-01-01	0.048
1981-04-01	0.042
1981-07-01	0.043
1981-10-01	0.044
1989-07-01	0.175
1989-10-01	0.175
1990-01-01	0.175
1990-04-01	0.175
1990-07-01	0.175
1990-10-01	0.252
1991-01-01	0.253
1991-04-01	0.252
1991-07-01	0.255
1991-10-01	0.251
1992-01-01	0.252
1992-04-01	0.250
1992-07-01	0.246
1992-10-01	0.244
1993-01-01	0.246
1993-04-01	0.469
1993-07-01	1.966
1993-10-01	1.965
1994-01-01	1.967
1994-04-01	1.979
1994-07-01	1.986
1994-10-01	1.987
1995-01-01	1.990
1995-04-01	1.985
1995-07-01	2.238
1995-10-01	2.258
1996-01-01	2.404
1996-04-01	2.407
1996-07-01	2.684
1996-10-01	2.705
1997-01-01	2.694
1997-04-01	3.199
1997-07-01	3.192
1997-10-01	3.198
1998-01-01	3.202
1998-04-01	3.199
1998-07-01	3.204
1998-10-01	3.062
1999-01-01	3.054
1999-04-01	3.220
1999-07-01	3.227
1999-10-01	3.224
2000-01-01	3.202
2000-04-01	3.194
2000-07-01	3.040
2000-10-01	3.042
2001-01-01	3.035
2001-04-01	3.908
2001-07-01	3.840
2001-10-01	3.838
2002-01-01	3.835
2002-04-01	3.847
2002-07-01	4.079
2002-10-01	4.084
2003-01-01	4.081
2003-04-01	4.088
2003-07-01	4.090
2003-10-01	4.101
2004-01-01	5.781
2004-04-01	5.760
2004-07-01	5.764
2004-10-01	6.907
2005-01-01	7.957
2005-04-01	9.922
2005-07-01	10.915
2005-10-01	13.108
2006-01-01	18.031
2006-04-01	20.970
2006-07-01	21.537
2006-10-01	32.861
2007-01-01	38.249
2007-04-01	40.199
2007-07-01	47.035
2007-10-01	55.145
2008-01-01	54.382
2008-04-01	61.706
2008-07-01	65.917
2008-10-01	64.842
2009-01-01	62.684
2009-04-01	74.011
2009-07-01	81.665
2009-10-01	83.047
2010-01-01	81.913
2010-04-01	79.888
2010-07-01	82.567
2010-10-01	87.613
2011-01-01	92.830
2011-04-01	96.000
2011-07-01	94.209
2011-10-01	100.592
2012-01-01	103.026
2012-04-01	100.606
2012-07-01	103.440
2012-10-01	108.514
2013-01-01	115.358
2013-04-01	115.928
2013-07-01	115.802
2013-10-01	117.250
2014-01-01	118.189
2014-04-01	123.396
2014-07-01	119.575
2014-10-01	118.614
2015-01-01	123.236
2015-04-01	126.637