Quarter	Millions of US Dollars
2005-01-01	20560
2005-04-01	23137
2005-07-01	23642
2005-10-01	25899
2006-01-01	31277
2006-04-01	33453
2006-07-01	36903
2006-10-01	47876
2007-01-01	63461
2007-04-01	70793
2007-07-01	73382
2007-10-01	90261
2008-01-01	90436
2008-04-01	90374
2008-07-01	84375
2008-10-01	80338
2009-01-01	82482
2009-04-01	87265
2009-07-01	91534
2009-10-01	98789
2010-01-01	108303
2010-04-01	111221
2010-07-01	127966
2010-10-01	134832
2011-01-01	142881
2011-04-01	145571
2011-07-01	151091
2011-10-01	153295
2012-01-01	159547
2012-04-01	144584
2012-07-01	138827
2012-10-01	146497
2013-01-01	164578
2013-04-01	143746
2013-07-01	133413
2013-10-01	127730
2014-01-01	129721
2014-04-01	132617
2014-07-01	130048
2014-10-01	131677
2015-01-01	128289
2015-04-01	127888
2015-07-01	115445
2015-10-01	114702
2016-01-01	135003
2016-04-01	130485
2016-07-01	129940
2016-10-01	128831
2017-01-01	138145
2017-04-01	135052
2017-07-01	135203
2017-10-01	142351
2018-01-01	145382