Quarter	Billions of US Dollars
1998-01-01	70.533
1998-04-01	74.766
1998-07-01	44.764
1998-10-01	41.205
1999-01-01	37.258
1999-04-01	39.061
1999-07-01	41.012
1999-10-01	42.709
2000-01-01	42.824
2000-04-01	45.994
2000-07-01	51.830
2000-10-01	57.208
2001-01-01	58.688
2001-04-01	63.139
2001-07-01	69.681
2001-10-01	74.402
2002-01-01	76.563
2002-04-01	81.227
2002-07-01	85.793
2002-10-01	91.759
2003-01-01	100.220
2003-04-01	111.410
2003-07-01	122.003
2003-10-01	135.523
2004-01-01	151.180
2004-04-01	159.080
2004-07-01	166.307
2004-10-01	198.596
2005-01-01	194.678
2005-04-01	203.114
2005-07-01	223.886
2005-10-01	249.942
2006-01-01	269.561
2006-04-01	294.776
2006-07-01	305.983
2006-10-01	348.334
2007-01-01	375.241
2007-04-01	457.856
2007-07-01	522.946
2007-10-01	568.865
2008-01-01	652.280
2008-04-01	693.875
2008-07-01	683.619
2008-10-01	639.971
2009-01-01	605.455
2009-04-01	618.773
2009-07-01	648.432
2009-10-01	657.410
2010-01-01	652.256
2010-04-01	636.783
2010-07-01	668.008
2010-10-01	682.134
2011-01-01	732.764
2011-04-01	774.418
2011-07-01	737.934
2011-10-01	769.939
2012-01-01	824.596
2012-04-01	805.002
2012-07-01	851.256
2012-10-01	885.994
2013-01-01	920.629
2013-04-01	912.255
2013-07-01	957.339
2013-10-01	958.215
2014-01-01	932.895
2014-04-01	977.873
2014-07-01	889.812
2014-10-01	714.427
2015-01-01	710.600
2015-04-01	730.170
2015-07-01	662.520
2015-10-01	650.732
2016-01-01	698.638
2016-04-01	695.965
2016-07-01	708.102
2016-10-01	725.664
2017-01-01	774.032
2017-04-01	757.632
2017-07-01	779.498
2017-10-01	780.003
2018-01-01	790.922