Quarter	US dollars
1999-03-31	8
1999-06-30	9
1999-09-30	11
1999-12-31	12
2000-03-31	11
2000-06-30	10
2000-09-30	7
2000-12-31	7
2001-03-31	7
2001-06-30	9
2001-09-30	9
2001-12-31	7
2002-03-31	11
2002-06-30	12
2002-09-30	12
2002-12-31	13
2003-03-31	10
2003-06-30	11
2003-09-30	12
2003-12-31	12
2004-03-31	33
2004-06-30	20
2004-09-30	15
2004-12-31	11
2005-03-31	10
2005-06-30	10
2005-09-30	10
2005-12-31	11
2006-03-31	12
2006-06-30	13
2006-09-30	15
2006-12-31	13
2007-03-31	11
2007-06-30	10
2007-09-30	18
2007-12-31	19
2008-03-31	11
2008-06-30	15
2008-09-30	19
2008-12-31	12
2009-03-31	65
2009-06-30	42
2009-09-30	34
2009-12-31	41
2010-03-31	78
2010-06-30	80
2010-09-30	81
2010-12-31	29
2011-03-31	47
2011-06-30	62
2011-09-30	171
2011-12-31	91
2012-03-31	140
2012-06-30	189
2012-09-30	142
2012-12-31	144
2013-03-31	84
2013-06-30	99
2013-09-30	95
2013-12-31	100
2014-03-31	114
2014-06-30	310
2014-09-30	168
2014-12-31	97
2015-03-31	96
2015-06-30	49