Quarter	Millions of US Dollars
1999-04-01	155
1999-07-01	160
1999-10-01	226
2000-01-01	215
2000-04-01	215
2000-07-01	197
2000-10-01	209
2001-01-01	199
2001-04-01	191
2001-07-01	205
2001-10-01	375
2002-01-01	371
2002-04-01	424
2002-07-01	419
2002-10-01	446
2003-01-01	463
2003-04-01	486
2003-07-01	495
2003-10-01	537
2004-01-01	520
2004-04-01	729
2004-07-01	745
2004-10-01	817
2005-01-01	778
2005-04-01	726
2005-07-01	723
2005-10-01	708
2006-01-01	726
2006-04-01	763
2006-07-01	760
2006-10-01	790
2007-01-01	799
2007-04-01	810
2007-07-01	851
2007-10-01	883
2008-01-01	1581
2008-04-01	1576
2008-07-01	1430
2008-10-01	1113
2009-01-01	1065
2009-04-01	1131
2009-07-01	1171
2009-10-01	1152
2010-01-01	1078
2010-04-01	982
2010-07-01	1092
2010-10-01	1069
2011-01-01	1137
2011-04-01	1656
2011-07-01	1580
2011-10-01	1535
2012-01-01	2568
2012-04-01	2507
2012-07-01	2534
2012-10-01	3806
2013-01-01	3774
2013-04-01	3796
2013-07-01	3830
2013-10-01	3853
2014-01-01	6611
2014-04-01	7394
2014-07-01	5789
2014-10-01	5701
2015-01-01	5365
2015-04-01	5469
2015-07-01	6033
2015-10-01	6540
2016-01-01	6713
2016-04-01	7336
2016-07-01	7360
2016-10-01	8475
2017-01-01	8411
2017-04-01	9945
2017-07-01	10228
2017-10-01	10362
2018-01-01	10105
2018-04-01	10763