Quarter	Millions of US Dollars
2000-01-01	16258
2000-04-01	17926
2000-07-01	20375
2000-10-01	21205
2001-01-01	21703
2001-04-01	22653
2001-07-01	23918
2001-10-01	25204
2002-01-01	25699
2002-04-01	27212
2002-07-01	27351
2002-10-01	27860
2003-01-01	26617
2003-04-01	28807
2003-07-01	28902
2003-10-01	30767
2004-01-01	29682
2004-04-01	29024
2004-07-01	29911
2004-10-01	32036
2005-01-01	32139
2005-04-01	31576
2005-07-01	31172
2005-10-01	32636
2006-01-01	33734
2006-04-01	34696
2006-07-01	34511
2006-10-01	36592
2007-01-01	37421
2007-04-01	39856
2007-07-01	40050
2007-10-01	43331
2008-01-01	45630
2008-04-01	45980
2008-07-01	43569
2008-10-01	41208
2009-01-01	35787
2009-04-01	40749
2009-07-01	42886
2009-10-01	43576
2010-01-01	44929
2010-04-01	46442
2010-07-01	51566
2010-10-01	53697
2011-01-01	65600
2011-04-01	69115
2011-07-01	67487
2011-10-01	65660
2012-01-01	69119
2012-04-01	69849
2012-07-01	78580
2012-10-01	79998
2013-01-01	81901
2013-04-01	82375
2013-07-01	83270
2013-10-01	84108
2014-01-01	88412
2014-04-01	92467
2014-07-01	97424
2014-10-01	96695
2015-01-01	95275
2015-04-01	101770
2015-07-01	95512
2015-10-01	98420
2016-01-01	105529
2016-04-01	108970
2016-07-01	111842
2016-10-01	97537
2017-01-01	102692
2017-04-01	120214
2017-07-01	127903
2017-10-01	134756
2018-01-01	141256