Quarter	Millions of US Dollars
2001-10-01	7866
2002-01-01	7719
2002-04-01	9647
2002-07-01	11707
2002-10-01	8986
2003-01-01	7647
2003-04-01	8223
2003-07-01	8593
2003-10-01	7196
2004-01-01	6933
2004-04-01	8683
2004-07-01	9449
2004-10-01	9507
2005-01-01	10283
2005-04-01	11249
2005-07-01	11250
2005-10-01	8022
2006-01-01	9611
2006-04-01	10833
2006-07-01	10983
2006-10-01	9766
2007-01-01	11348
2007-04-01	13951
2007-07-01	14885
2007-10-01	15084
2008-01-01	15713
2008-04-01	21394
2008-07-01	18391
2008-10-01	12445
2009-01-01	12553
2009-04-01	13431
2009-07-01	13744
2009-10-01	10249
2010-01-01	9343
2010-04-01	9674
2010-07-01	9620
2010-10-01	8720
2011-01-01	10023
2011-04-01	10981
2011-07-01	11066
2011-10-01	9816
2012-01-01	11072
2012-04-01	12834
2012-07-01	11691
2012-10-01	13267
2013-01-01	11436
2013-04-01	12136
2013-07-01	11866
2013-10-01	12332
2014-01-01	13326
2014-04-01	13902
2014-07-01	12116
2014-10-01	9929
2015-01-01	9534
2015-04-01	12929
2015-07-01	12911
2015-10-01	11715
2016-01-01	13849
2016-04-01	13643
2016-07-01	13118
2016-10-01	11911
2017-01-01	12691
2017-04-01	14349
2017-07-01	14324
2017-10-01	13468
2018-01-01	14446