Quarter	Millions of US Dollars
1993-01-01	0
1993-04-01	0
1993-07-01	0
1993-10-01	0
1994-01-01	0
1994-04-01	1
1994-07-01	12
1994-10-01	12
1995-01-01	13
1995-04-01	46
1995-07-01	80
1995-10-01	149
1996-01-01	164
1996-04-01	191
1996-07-01	280
1996-10-01	310
1997-01-01	349
1997-04-01	378
1997-07-01	388
1997-10-01	378
1998-01-01	372
1998-04-01	353
1998-07-01	350
1998-10-01	329
1999-01-01	267
1999-04-01	253
1999-07-01	277
1999-10-01	257
2000-01-01	255
2000-04-01	243
2000-07-01	202
2000-10-01	200
2001-01-01	196
2001-04-01	185
2001-07-01	160
2001-10-01	150
2002-01-01	121
2002-04-01	232
2002-07-01	258
2002-10-01	299
2003-01-01	313
2003-04-01	321
2003-07-01	338
2003-10-01	360
2004-01-01	370
2004-04-01	370
2004-07-01	369
2004-10-01	427
2005-01-01	410
2005-04-01	391
2005-07-01	369
2005-10-01	369
2006-01-01	391
2006-04-01	394
2006-07-01	400
2006-10-01	481
2007-01-01	511
2007-04-01	500
2007-07-01	490
2007-10-01	540
2008-01-01	615
2008-04-01	749
2008-07-01	688
2008-10-01	675
2009-01-01	640
2009-04-01	675
2009-07-01	706
2009-10-01	697
2010-01-01	628
2010-04-01	620
2010-07-01	712
2010-10-01	662
2011-01-01	713
2011-04-01	726
2011-07-01	686
2011-10-01	667
2012-01-01	701
2012-04-01	648
2012-07-01	677
2012-10-01	444
2013-01-01	433
2013-04-01	474
2013-07-01	588
2013-10-01	3349
2014-01-01	3748
2014-04-01	4478
2014-07-01	4207
2014-10-01	4061
2015-01-01	3614
2015-04-01	3752
2015-07-01	3748
2015-10-01	3973
2016-01-01	4086
2016-04-01	3981
2016-07-01	4180
2016-10-01	3902
2017-01-01	3943
2017-04-01	4314
2017-07-01	4531
2017-10-01	4572
2018-01-01	5056