Quarter	Billions of US Dollars
1993-01-01	20.840
1993-04-01	21.376
1993-07-01	22.883
1993-10-01	22.541
1994-01-01	23.522
1994-04-01	25.434
1994-07-01	26.434
1994-10-01	27.447
1995-01-01	29.912
1995-04-01	30.232
1995-07-01	30.583
1995-10-01	30.576
1996-01-01	30.696
1996-04-01	31.256
1996-07-01	31.879
1996-10-01	31.709
1997-01-01	33.906
1997-04-01	31.604
1997-07-01	31.102
1997-10-01	30.346
1998-01-01	30.822
1998-04-01	31.239
1998-07-01	33.513
1998-10-01	32.394
1999-01-01	27.753
1999-04-01	27.500
1999-07-01	28.754
1999-10-01	25.630
2000-01-01	23.100
2000-04-01	23.308
2000-07-01	22.140
2000-10-01	23.099
2001-01-01	22.223
2001-04-01	21.787
2001-07-01	19.505
2001-10-01	19.029
2002-01-01	18.748
2002-04-01	21.673
2002-07-01	20.471
2002-10-01	20.979
2003-01-01	22.032
2003-04-01	23.336
2003-07-01	24.049
2003-10-01	26.613
2004-01-01	26.122
2004-04-01	27.829
2004-07-01	30.233
2004-10-01	35.265
2005-01-01	35.648
2005-04-01	35.076
2005-07-01	37.263
2005-10-01	38.801
2006-01-01	42.142
2006-04-01	47.477
2006-07-01	50.138
2006-10-01	56.962
2007-01-01	58.827
2007-04-01	62.359
2007-07-01	72.980
2007-10-01	82.117
2008-01-01	95.736
2008-04-01	107.167
2008-07-01	98.835
2008-10-01	90.128
2009-01-01	85.007
2009-04-01	96.028
2009-07-01	103.250
2009-10-01	96.670
2010-01-01	94.155
2010-04-01	85.568
2010-07-01	101.067
2010-10-01	98.477
2011-01-01	108.103
2011-04-01	112.921
2011-07-01	105.588
2011-10-01	98.330
2012-01-01	106.304
2012-04-01	97.794
2012-07-01	103.154
2012-10-01	105.797
2013-01-01	101.386
2013-04-01	102.867
2013-07-01	108.245
2013-10-01	105.225
2014-01-01	104.577
2014-04-01	104.412
2014-07-01	96.466
2014-10-01	93.646
2015-01-01	84.177
2015-04-01	91.219
2015-07-01	94.155
2015-10-01	92.009
2016-01-01	98.119
2016-04-01	96.966
2016-07-01	100.508
2016-10-01	95.227
2017-01-01	98.517
2017-04-01	110.661
2017-07-01	117.585
2017-10-01	121.860
2018-01-01	127.224