Quarter	Millions of US Dollars
1995-10-01	27438
1996-01-01	29057
1996-04-01	27491
1996-07-01	29415
1996-10-01	29343
1997-01-01	30908
1997-04-01	29103
1997-07-01	30098
1997-10-01	29907
1998-01-01	30524
1998-04-01	29938
1998-07-01	31912
1998-10-01	31310
1999-01-01	31772
1999-04-01	27942
1999-07-01	28892
1999-10-01	28306
2000-01-01	26162
2000-04-01	24554
2000-07-01	23802
2000-10-01	25575
2001-01-01	26809
2001-04-01	26192
2001-07-01	28271
2001-10-01	26905
2002-01-01	28862
2002-04-01	35032
2002-07-01	36680
2002-10-01	39664
2003-01-01	37982
2003-04-01	37524
2003-07-01	38051
2003-10-01	41777
2004-01-01	39844
2004-04-01	40909
2004-07-01	43140
2004-10-01	49923
2005-01-01	48428
2005-04-01	45611
2005-07-01	49344
2005-10-01	47348
2006-01-01	49863
2006-04-01	50360
2006-07-01	50400
2006-10-01	56291
2007-01-01	53463
2007-04-01	54682
2007-07-01	64638
2007-10-01	68071
2008-01-01	71426
2008-04-01	74493
2008-07-01	66831
2008-10-01	64746
2009-01-01	76240
2009-04-01	92334
2009-07-01	113705
2009-10-01	115508
2010-01-01	111474
2010-04-01	103384
2010-07-01	118641
2010-10-01	119841
2011-01-01	128447
2011-04-01	134897
2011-07-01	128675
2011-10-01	132795
2012-01-01	141265
2012-04-01	136379
2012-07-01	146631
2012-10-01	151386
2013-01-01	146616
2013-04-01	142945
2013-07-01	143748
2013-10-01	140703
2014-01-01	146348
2014-04-01	136132
2014-07-01	127673
2014-10-01	110115
2015-01-01	99408
2015-04-01	102063
2015-07-01	95829
2015-10-01	91463
2016-01-01	100482
2016-04-01	98646
2016-07-01	104934
2016-10-01	100094
2017-01-01	104069
2017-04-01	107578
2017-07-01	113561
2017-10-01	109193
2018-01-01	116491