Quarter	Millions of US Dollars
2003-01-01	11957
2003-04-01	12310
2003-07-01	13872
2003-10-01	15099
2004-01-01	15248
2004-04-01	14956
2004-07-01	14775
2004-10-01	16197
2005-01-01	15875
2005-04-01	15495
2005-07-01	15999
2005-10-01	17427
2006-01-01	18322
2006-04-01	20738
2006-07-01	21930
2006-10-01	23347
2007-01-01	25453
2007-04-01	27394
2007-07-01	27939
2007-10-01	29925
2008-01-01	28657
2008-04-01	27186
2008-07-01	27576
2008-10-01	27631
2009-01-01	28018
2009-04-01	31835
2009-07-01	34315
2009-10-01	34426
2010-01-01	35865
2010-04-01	36193
2010-07-01	38551
2010-10-01	39265
2011-01-01	39742
2011-04-01	39609
2011-07-01	39201
2011-10-01	38928
2012-01-01	42449
2012-04-01	40546
2012-07-01	43068
2012-10-01	43699
2013-01-01	46409
2013-04-01	45145
2013-07-01	46752
2013-10-01	46248
2014-01-01	49015
2014-04-01	50557
2014-07-01	53440
2014-10-01	53946
2015-01-01	55643
2015-04-01	55687
2015-07-01	54321
2015-10-01	55540
2016-01-01	66589
2016-04-01	68889
2016-07-01	70783
2016-10-01	63960
2017-01-01	68138
2017-04-01	71293
2017-07-01	73650
2017-10-01	74981
2018-01-01	80909