Quarter	Millions of US Dollars
1995-10-01	41026
1996-01-01	38614
1996-04-01	38257
1996-07-01	37385
1996-10-01	37688
1997-01-01	36387
1997-04-01	29413
1997-07-01	31580
1997-10-01	31118
1998-01-01	29730
1998-04-01	27872
1998-07-01	28385
1998-10-01	25554
1999-01-01	23951
1999-04-01	24275
1999-07-01	25810
1999-10-01	25074
2000-01-01	24176
2000-04-01	23750
2000-07-01	22270
2000-10-01	24481
2001-01-01	24433
2001-04-01	20757
2001-07-01	22339
2001-10-01	22848
2002-01-01	23593
2002-04-01	28197
2002-07-01	30318
2002-10-01	30965
2003-01-01	33700
2003-04-01	35771
2003-07-01	40201
2003-10-01	41744
2004-01-01	40844
2004-04-01	39696
2004-07-01	41516
2004-10-01	41648
2005-01-01	38301
2005-04-01	38655
2005-07-01	38296
2005-10-01	37527
2006-01-01	38710
2006-04-01	42160
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	52916
2008-04-01	55471
2008-07-01	49083
2008-10-01	51563
2009-01-01	62051
2009-04-01	72583
2009-07-01	94867
2009-10-01	96893
2010-01-01	98198
2010-04-01	93180
2010-07-01	103574
2010-10-01	102341
2011-01-01	104936
2011-04-01	97047
2011-07-01	89563
2011-10-01	86134
2012-01-01	97884
2012-04-01	95484
2012-07-01	101472
2012-10-01	105100
2013-01-01	106281
2013-04-01	91293
2013-07-01	95090
2013-10-01	94142
2014-01-01	94280
2014-04-01	88301
2014-07-01	87084
2014-10-01	78757
2015-01-01	77596
2015-04-01	74193
2015-07-01	69733
2015-10-01	68375
2016-01-01	77491
2016-04-01	77552
2016-07-01	80142
2016-10-01	74303
2017-01-01	76915
2017-04-01	74697
2017-07-01	80199
2017-10-01	79120
2018-01-01	84557