Quarter	US dollars
1999-03-31	10
1999-06-30	13
1999-09-30	15
1999-12-31	8
2000-03-31	8
2000-06-30	8
2000-09-30	8
2000-12-31	18
2001-03-31	24
2001-06-30	24
2001-09-30	27
2001-12-31	26
2002-03-31	28
2002-06-30	31
2002-09-30	37
2002-12-31	37
2003-03-31	36
2003-06-30	39
2003-09-30	41
2003-12-31	41
2004-03-31	54
2004-06-30	62
2004-09-30	87
2004-12-31	93
2005-03-31	79
2005-06-30	60
2005-09-30	87
2005-12-31	70
2006-03-31	52
2006-06-30	80
2006-09-30	125
2006-12-31	62
2007-03-31	62
2007-06-30	66
2007-09-30	108
2007-12-31	73
2008-03-31	156
2008-06-30	72
2008-09-30	104
2008-12-31	76
2009-03-31	62
2009-06-30	80
2009-09-30	84
2009-12-31	42
2010-03-31	51
2010-06-30	66
2010-09-30	36
2010-12-31	45
2011-03-31	52
2011-06-30	44
2011-09-30	55
2011-12-31	23
2012-03-31	16
2012-06-30	34
2012-09-30	14
2012-12-31	23
2013-03-31	17
2013-06-30	10
2013-09-30	19
2013-12-31	24
2014-03-31	25
2014-06-30	17
2014-09-30	11
2014-12-31	12
2015-03-31	19
2015-06-30	14