Quarter	Millions of US Dollars
1995-10-01	30826
1996-01-01	28582
1996-04-01	28638
1996-07-01	29213
1996-10-01	31046
1997-01-01	32703
1997-04-01	27051
1997-07-01	29262
1997-10-01	28173
1998-01-01	27604
1998-04-01	27230
1998-07-01	27409
1998-10-01	25236
1999-01-01	23571
1999-04-01	23692
1999-07-01	24382
1999-10-01	23971
2000-01-01	22739
2000-04-01	22294
2000-07-01	20596
2000-10-01	23340
2001-01-01	23575
2001-04-01	20217
2001-07-01	21927
2001-10-01	21849
2002-01-01	22207
2002-04-01	26668
2002-07-01	28524
2002-10-01	29995
2003-01-01	33700
2003-04-01	35693
2003-07-01	39684
2003-10-01	40545
2004-01-01	39408
2004-04-01	38951
2004-07-01	40124
2004-10-01	41597
2005-01-01	38246
2005-04-01	38655
2005-07-01	38296
2005-10-01	37527
2006-01-01	38704
2006-04-01	42134
2006-07-01	40907
2006-10-01	44488
2007-01-01	39986
2007-04-01	41410
2007-07-01	47119
2007-10-01	48352
2008-01-01	52915
2008-04-01	55471
2008-07-01	49083
2008-10-01	51562
2009-01-01	62051
2009-04-01	72583
2009-07-01	93683
2009-10-01	96893
2010-01-01	96140
2010-04-01	91034
2010-07-01	101417
2010-10-01	101004
2011-01-01	102896
2011-04-01	95317
2011-07-01	87644
2011-10-01	84165
2012-01-01	95774
2012-04-01	94730
2012-07-01	100217
2012-10-01	103576
2013-01-01	104249
2013-04-01	90587
2013-07-01	93898
2013-10-01	92766
2014-01-01	92491
2014-04-01	87548
2014-07-01	85921
2014-10-01	77679
2015-01-01	76432
2015-04-01	73516
2015-07-01	68904
2015-10-01	67365
2016-01-01	76329
2016-04-01	76889
2016-07-01	79265
2016-10-01	73323
2017-01-01	75955
2017-04-01	74080
2017-07-01	79355
2017-10-01	78097
2018-01-01	83527