Quarter	Billions of US Dollars
1996-01-01	194.698
1996-04-01	190.227
1996-07-01	194.184
1996-10-01	197.100
1997-01-01	170.561
1997-04-01	171.657
1997-07-01	172.447
1997-10-01	173.322
1998-01-01	171.281
1998-04-01	170.521
1998-07-01	177.336
1998-10-01	174.255
1999-01-01	165.349
1999-04-01	162.733
1999-07-01	165.962
1999-10-01	161.484
2000-01-01	151.486
2000-04-01	138.504
2000-07-01	123.459
2000-10-01	127.448
2001-01-01	123.495
2001-04-01	115.787
2001-07-01	119.618
2001-10-01	122.798
2002-01-01	118.613
2002-04-01	132.254
2002-07-01	135.798
2002-10-01	148.161
2003-01-01	155.117
2003-04-01	160.797
2003-07-01	169.296
2003-10-01	185.287
2004-01-01	179.778
2004-04-01	177.057
2004-07-01	180.928
2004-10-01	207.165
2005-01-01	194.566
2005-04-01	173.191
2005-07-01	175.942
2005-10-01	179.613
2006-01-01	173.572
2006-04-01	184.043
2006-07-01	184.927
2006-10-01	198.579
2007-01-01	189.049
2007-04-01	187.889
2007-07-01	196.443
2007-10-01	201.781
2008-01-01	206.177
2008-04-01	196.013
2008-07-01	183.869
2008-10-01	163.874
2009-01-01	143.752
2009-04-01	162.563
2009-07-01	183.091
2009-10-01	191.268
2010-01-01	180.871
2010-04-01	167.667
2010-07-01	192.927
2010-10-01	202.737
2011-01-01	206.369
2011-04-01	208.496
2011-07-01	191.035
2011-10-01	201.066
2012-01-01	204.766
2012-04-01	196.675
2012-07-01	210.204
2012-10-01	215.887
2013-01-01	230.958
2013-04-01	228.703
2013-07-01	240.317
2013-10-01	239.088
2014-01-01	239.949
2014-04-01	240.074
2014-07-01	226.632
2014-10-01	231.655
2015-01-01	207.728
2015-04-01	220.926
2015-07-01	216.320
2015-10-01	219.962
2016-01-01	222.311
2016-04-01	219.079
2016-07-01	210.691
2016-10-01	204.799
2017-01-01	207.721
2017-04-01	218.525
2017-07-01	219.485
2017-10-01	227.171
2018-01-01	210.628