Quarter	Millions of US Dollars
2001-10-01	7011
2002-10-01	9062
2003-10-01	11556
2004-10-01	13520
2005-10-01	12733
2006-10-01	15412
2007-01-01	15945
2007-04-01	16570
2007-07-01	17294
2007-10-01	18207
2008-01-01	19576
2008-04-01	19024
2008-07-01	17246
2008-10-01	17437
2009-01-01	15787
2009-04-01	17954
2009-07-01	18499
2009-10-01	20438
2010-01-01	19357
2010-04-01	17970
2010-07-01	21881
2010-10-01	21538
2011-01-01	23256
2011-04-01	23000
2011-07-01	23151
2011-10-01	22791
2012-01-01	24437
2012-04-01	24640
2012-07-01	25306
2012-10-01	26999
2013-01-01	26920
2013-04-01	29112
2013-07-01	30072
2013-10-01	32602
2014-01-01	33382
2014-04-01	33574
2014-07-01	31310
2014-10-01	31457
2015-01-01	29881
2015-04-01	30823
2015-07-01	30794
2015-10-01	30454
2016-01-01	32276
2016-04-01	31405
2016-07-01	32284
2016-10-01	31165
2017-01-01	33344
2017-04-01	33197
2017-07-01	33873
2017-10-01	36210
2018-01-01	36939