Quarter	US dollars
1999-03-31	78959
1999-06-30	129389
1999-09-30	57383
1999-12-31	27879
2000-03-31	41212
2000-06-30	46861
2000-09-30	37216
2000-12-31	8926
2001-03-31	13525
2001-06-30	16598
2001-09-30	18036
2001-12-31	17202
2002-03-31	25154
2002-06-30	22567
2002-09-30	25526
2002-12-31	31002
2003-03-31	35579
2003-06-30	43268
2003-09-30	53737
2003-12-31	47905
2004-03-31	48002
2004-06-30	45511
2004-09-30	47072
2004-12-31	32839
2005-03-31	38928
2005-06-30	42784
2005-09-30	36886
2005-12-31	49949
2006-03-31	54120
2006-06-30	60596
2006-09-30	54796
2006-12-31	69968
2007-03-31	70539
2007-06-30	89962
2007-09-30	98168
2007-12-31	69834
2008-03-31	75291
2008-06-30	80489
2008-09-30	78554
2008-12-31	108857
2009-03-31	119576
2009-06-30	110358
2009-09-30	95120
2009-12-31	84748
2010-03-31	75882
2010-06-30	80909
2010-09-30	80499
2010-12-31	87509
2011-03-31	77080
2011-06-30	75629
2011-09-30	83306
2011-12-31	86866
2012-03-31	72029
2012-06-30	71742
2012-09-30	73436
2012-12-31	79213
2013-03-31	79107
2013-06-30	61842
2013-09-30	63986
2013-12-31	64266
2014-03-31	76696
2014-06-30	77353
2014-09-30	65870
2014-12-31	62051
2015-03-31	68806
2015-06-30	72785
2015-09-30	68934
2015-12-31	57270
2016-03-31	69670
2016-06-30	66724