Quarter	Millions of US Dollars
1995-10-01	24137
1996-01-01	22977
1996-04-01	23045
1996-07-01	23426
1996-10-01	24685
1997-01-01	24927
1997-04-01	22830
1997-07-01	23548
1997-10-01	22903
1998-01-01	23304
1998-04-01	22906
1998-07-01	22511
1998-10-01	21312
1999-01-01	19835
1999-04-01	19457
1999-07-01	19597
1999-10-01	18899
2000-01-01	18279
2000-04-01	18578
2000-07-01	17610
2000-10-01	19347
2001-01-01	19241
2001-04-01	16388
2001-07-01	17452
2001-10-01	17392
2002-01-01	17709
2002-04-01	21797
2002-07-01	22585
2002-10-01	22093
2003-01-01	23979
2003-04-01	25435
2003-07-01	26903
2003-10-01	29556
2004-01-01	29641
2004-04-01	28654
2004-07-01	30282
2004-10-01	30006
2005-01-01	29153
2005-04-01	29793
2005-07-01	29495
2005-10-01	28939
2006-01-01	30549
2006-04-01	33377
2006-07-01	32879
2006-10-01	35494
2007-01-01	31932
2007-04-01	33115
2007-07-01	38292
2007-10-01	39468
2008-01-01	43516
2008-04-01	45193
2008-07-01	40989
2008-10-01	36295
2009-01-01	40124
2009-04-01	36240
2009-07-01	41409
2009-10-01	44290
2010-01-01	45212
2010-04-01	44330
2010-07-01	49716
2010-10-01	50060
2011-01-01	53501
2011-04-01	47399
2011-07-01	46082
2011-10-01	45910
2012-01-01	52915
2012-04-01	53268
2012-07-01	57284
2012-10-01	61807
2013-01-01	65310
2013-04-01	55796
2013-07-01	58540
2013-10-01	60897
2014-01-01	67155
2014-04-01	67965
2014-07-01	66320
2014-10-01	61161
2015-01-01	59685
2015-04-01	55134
2015-07-01	52248
2015-10-01	51556
2016-01-01	58444
2016-04-01	59441
2016-07-01	62008
2016-10-01	57717
2017-01-01	60937
2017-04-01	58421
2017-07-01	62925
2017-10-01	62363
2018-01-01	66460