Quarter	Millions of US Dollars
1995-01-01	39566
1995-04-01	40514
1995-07-01	42783
1995-10-01	43649
1996-01-01	45680
1996-04-01	45368
1996-07-01	47920
1996-10-01	49556
1997-01-01	51319
1997-04-01	49933
1997-07-01	52825
1997-10-01	51528
1998-01-01	51597
1998-04-01	51068
1998-07-01	50954
1998-10-01	49991
1999-01-01	50912
1999-04-01	51573
1999-07-01	50438
1999-10-01	52229
2000-01-01	54864
2000-04-01	54065
2000-07-01	54175
2000-10-01	53933
2001-01-01	53501
2001-04-01	55216
2001-07-01	54173
2001-10-01	55875
2002-01-01	54904
2002-04-01	54083
2002-07-01	53562
2002-10-01	56472
2003-01-01	59108
2003-04-01	66762
2003-07-01	67002
2003-10-01	70235
2004-01-01	69951
2004-04-01	71257
2004-07-01	72748
2004-10-01	77331
2005-01-01	77871
2005-04-01	75216
2005-07-01	76554
2005-10-01	75771
2006-01-01	76786
2006-04-01	75581
2006-07-01	78421
2006-10-01	82551
2007-01-01	84204
2007-04-01	79500
2007-07-01	85333
2007-10-01	90221
2008-01-01	96591
2008-04-01	105717
2008-07-01	104906
2008-10-01	101588
2009-01-01	98628
2009-04-01	107158
2009-07-01	115310
2009-10-01	115750
2010-01-01	119804
2010-04-01	115372
2010-07-01	124968
2010-10-01	129649
2011-01-01	130460
2011-04-01	131181
2011-07-01	125123
2011-10-01	126941
2012-01-01	132128
2012-04-01	127880
2012-07-01	131939
2012-10-01	143614
2013-01-01	147985
2013-04-01	151430
2013-07-01	155673
2013-10-01	159975
2014-01-01	162169
2014-04-01	167322
2014-07-01	156973
2014-10-01	149284
2015-01-01	149415
2015-04-01	151284
2015-07-01	147622
2015-10-01	148683
2016-01-01	157061
2016-04-01	155503
2016-07-01	156177
2016-10-01	149876
2017-01-01	157085
2017-04-01	164851
2017-07-01	164259
2017-10-01	164163
2018-01-01	163977