Quarter	Millions of US Dollars
2005-10-01	117153
2006-01-01	117108
2006-04-01	121206
2006-07-01	142678
2006-10-01	159759
2007-01-01	164499
2007-04-01	179993
2007-07-01	184575
2007-10-01	189888
2008-01-01	200840
2008-04-01	214492
2008-07-01	206528
2008-10-01	171338
2009-01-01	178958
2009-04-01	200756
2009-07-01	203580
2009-10-01	205134
2010-01-01	228525
2010-04-01	226145
2010-07-01	233563
2010-10-01	241424
2011-01-01	267250
2011-04-01	291205
2011-07-01	263579
2011-10-01	269569
2012-01-01	312709
2012-04-01	308610
2012-07-01	338743
2012-10-01	335622
2013-01-01	372958
2013-04-01	365345
2013-07-01	369146
2013-10-01	385415
2014-01-01	403316
2014-04-01	417216
2014-07-01	410635
2014-10-01	385505
2015-01-01	382690
2015-04-01	379277
2015-07-01	355689
2015-10-01	347416
2016-01-01	349538
2016-04-01	310982
2016-07-01	307115
2016-10-01	290643
2017-01-01	333461
2017-04-01	354681
2017-07-01	362193
2017-10-01	328950
2018-01-01	363008