Quarter	US dollars
1999-03-31	51
1999-06-30	63
1999-09-30	72
1999-12-31	51
2000-03-31	22
2000-06-30	49
2000-09-30	37
2000-12-31	35
2001-03-31	10
2001-06-30	14
2001-09-30	71
2001-12-31	56
2002-03-31	44
2002-06-30	43
2002-09-30	43
2002-12-31	46
2003-03-31	74
2003-06-30	192
2003-09-30	248
2003-12-31	142
2004-03-31	75
2004-06-30	80
2004-09-30	67
2004-12-31	61
2005-03-31	59
2005-06-30	102
2005-09-30	126
2005-12-31	139
2006-03-31	69
2006-06-30	67
2006-09-30	111
2006-12-31	70
2007-03-31	113
2007-06-30	76
2007-09-30	90
2007-12-31	105
2008-03-31	69
2008-06-30	117
2008-09-30	165
2008-12-31	58
2009-03-31	89
2009-06-30	64
2009-09-30	71
2009-12-31	57
2010-03-31	50
2010-06-30	53
2010-09-30	43
2010-12-31	65
2011-03-31	118
2011-06-30	35
2011-09-30	36
2011-12-31	52
2012-03-31	53
2012-06-30	61
2012-09-30	88
2012-12-31	58
2013-03-31	45
2013-06-30	55
2013-09-30	72
2013-12-31	63
2014-03-31	218
2014-06-30	144
2014-09-30	112
2014-12-31	260
2015-03-31	158
2015-06-30	220