Quarter	US dollars
1999-03-31	66239
1999-06-30	121999
1999-09-30	47960
1999-12-31	8656
2000-03-31	30771
2000-06-30	35046
2000-09-30	27155
2000-12-31	1584
2001-03-31	2066
2001-06-30	3088
2001-09-30	3623
2001-12-31	4308
2002-03-31	4310
2002-06-30	5070
2002-09-30	8190
2002-12-31	8107
2003-03-31	11666
2003-06-30	12712
2003-09-30	13459
2003-12-31	13617
2004-03-31	12994
2004-06-30	11965
2004-09-30	9212
2004-12-31	12014
2005-03-31	23992
2005-06-30	16195
2005-09-30	17341
2005-12-31	12455
2006-03-31	17710
2006-06-30	21564
2006-09-30	25369
2006-12-31	30261
2007-03-31	25338
2007-06-30	37011
2007-09-30	42309
2007-12-31	35627
2008-03-31	29159
2008-06-30	17951
2008-09-30	16413
2008-12-31	12148
2009-03-31	13963
2009-06-30	14636
2009-09-30	10363
2009-12-31	5726
2010-03-31	15450
2010-06-30	18834
2010-09-30	18222
2010-12-31	22373
2011-03-31	29993
2011-06-30	10185
2011-09-30	16750
2011-12-31	10003
2012-03-31	10090
2012-06-30	9605
2012-09-30	10052
2012-12-31	12032
2013-03-31	18304
2013-06-30	14202
2013-09-30	11547
2013-12-31	12509
2014-03-31	10683
2014-06-30	8937
2014-09-30	9898
2014-12-31	10754
2015-03-31	10773
2015-06-30	15342
2015-09-30	19215
2015-12-31	23444