Quarter	Millions of US Dollars
1998-10-01	3628
1999-01-01	4677
1999-04-01	4883
1999-07-01	5245
1999-10-01	4458
2000-01-01	4249
2000-04-01	4023
2000-07-01	4385
2000-10-01	4122
2001-01-01	4928
2001-04-01	5308
2001-07-01	5380
2001-10-01	5399
2002-01-01	5469
2002-04-01	6063
2002-07-01	6547
2002-10-01	7281
2003-01-01	8483
2003-04-01	8302
2003-07-01	9863
2003-10-01	7852
2004-01-01	8730
2004-04-01	13932
2004-07-01	15194
2004-10-01	16965
2005-01-01	20784
2005-04-01	26841
2005-07-01	31887
2005-10-01	26214
2006-01-01	24710
2006-04-01	16871
2006-07-01	21096
2006-10-01	22086
2007-01-01	26863
2007-04-01	35878
2007-07-01	37083
2007-10-01	32163
2008-01-01	28472
2008-04-01	31728
2008-07-01	29935
2008-10-01	29835
2009-01-01	29675
2009-04-01	30746
2009-07-01	29053
2009-10-01	28959
2010-01-01	29959
2010-04-01	28890
2010-07-01	26669
2010-10-01	28234
2011-01-01	29958
2011-04-01	43847
2011-07-01	45189
2011-10-01	40078
2012-01-01	52408
2012-04-01	59059
2012-07-01	62329
2012-10-01	57375
2013-01-01	55177
2013-04-01	56858
2013-07-01	63773
2013-10-01	57904
2014-01-01	56540
2014-04-01	64113
2014-07-01	63018
2014-10-01	62576
2015-01-01	57829
2015-04-01	65737
2015-07-01	61274
2015-10-01	59166
2016-01-01	55278
2016-04-01	63802
2016-07-01	63071
2016-10-01	64289
2017-01-01	51159
2017-04-01	65576
2017-07-01	72030
2017-10-01	64334
2018-01-01	58244