Quarter	Millions of US Dollars
1995-10-01	8235
1996-01-01	7974
1996-04-01	7785
1996-07-01	8020
1996-10-01	8371
1997-01-01	8201
1997-04-01	7275
1997-07-01	7821
1997-10-01	7656
1998-01-01	7373
1998-04-01	7469
1998-07-01	7702
1998-10-01	7472
1999-01-01	7442
1999-04-01	7425
1999-07-01	7638
1999-10-01	7424
2000-01-01	6995
2000-04-01	6907
2000-07-01	6662
2000-10-01	6954
2001-01-01	7197
2001-04-01	7211
2001-07-01	7273
2001-10-01	7660
2002-01-01	7724
2002-04-01	9311
2002-07-01	9291
2002-10-01	12650
2003-01-01	12376
2003-04-01	13216
2003-07-01	13406
2003-10-01	14651
2004-01-01	13811
2004-04-01	14845
2004-07-01	15393
2004-10-01	17587
2005-01-01	17189
2005-04-01	16727
2005-07-01	16588
2005-10-01	16391
2006-01-01	17199
2006-04-01	19072
2006-07-01	21077
2006-10-01	22588
2007-01-01	24495
2007-04-01	27019
2007-07-01	29312
2007-10-01	30223
2008-01-01	30482
2008-04-01	29791
2008-07-01	25343
2008-10-01	18766
2009-01-01	20762
2009-04-01	22011
2009-07-01	25096
2009-10-01	25993
2010-01-01	25679
2010-04-01	22941
2010-07-01	25837
2010-10-01	26841
2011-01-01	29403
2011-04-01	29989
2011-07-01	27504
2011-10-01	26221
2012-01-01	27763
2012-04-01	26815
2012-07-01	29760
2012-10-01	32681
2013-01-01	32985
2013-04-01	36242
2013-07-01	37365
2013-10-01	37660
2014-01-01	39823
2014-04-01	39818
2014-07-01	39318
2014-10-01	34204
2015-01-01	31256
2015-04-01	33468
2015-07-01	30296
2015-10-01	29152
2016-01-01	29959
2016-04-01	30389
2016-07-01	31911
2016-10-01	30967
2017-01-01	32043
2017-04-01	32916
2017-07-01	34774
2017-10-01	36836
2018-01-01	39991