Quarter	Millions of US Dollars
1996-10-01	200
1997-01-01	200
1997-04-01	200
1997-07-01	200
1997-10-01	200
1998-01-01	200
1998-04-01	200
1998-07-01	378
1998-10-01	378
1999-01-01	369
1999-04-01	364
1999-07-01	305
1999-10-01	450
2000-01-01	429
2000-04-01	577
2000-07-01	629
2000-10-01	655
2001-01-01	632
2001-04-01	615
2001-07-01	565
2001-10-01	553
2002-01-01	549
2002-04-01	751
2002-07-01	752
2002-10-01	788
2003-01-01	812
2003-04-01	841
2003-07-01	855
2003-10-01	910
2004-01-01	893
2004-04-01	890
2004-07-01	903
2004-10-01	707
2005-01-01	683
2005-04-01	652
2005-07-01	648
2005-10-01	644
2006-01-01	657
2006-04-01	676
2006-07-01	679
2006-10-01	519
2007-01-01	533
2007-04-01	268
2007-07-01	280
2007-10-01	293
2008-01-01	324
2008-04-01	349
2008-07-01	315
2008-10-01	309
2009-01-01	295
2009-04-01	313
2009-07-01	325
2009-10-01	319
2010-01-01	299
2010-04-01	272
2010-07-01	303
2010-10-01	296
2011-01-01	315
2011-04-01	320
2011-07-01	299
2011-10-01	287
2012-01-01	296
2012-04-01	279
2012-07-01	287
2012-10-01	293
2013-01-01	284
2013-04-01	290
2013-07-01	299
2013-10-01	2888
2014-01-01	2888
2014-04-01	3924
2014-07-01	3615
2014-10-01	3488
2015-01-01	3091
2015-04-01	3214
2015-07-01	3218
2015-10-01	3128
2016-01-01	3271
2016-04-01	3189
2016-07-01	3206
2016-10-01	3028
2017-01-01	3071
2017-04-01	3278
2017-07-01	3392
2017-10-01	3445
2018-01-01	3928
2018-04-01	3716