Quarter	US dollars
1999-03-31	5
1999-06-30	3
1999-09-30	1
1999-12-31	11
2000-03-31	11
2000-06-30	13
2000-09-30	14
2000-12-31	4
2001-03-31	4
2001-06-30	35
2001-09-30	38
2001-12-31	25
2002-03-31	22
2002-06-30	151
2002-09-30	268
2002-12-31	38
2003-03-31	40
2003-06-30	41
2003-09-30	47
2003-12-31	55
2004-03-31	87
2004-06-30	51
2004-09-30	97
2004-12-31	107
2005-03-31	120
2005-06-30	95
2005-09-30	81
2005-12-31	83
2006-03-31	105
2006-06-30	80
2006-09-30	114
2006-12-31	83
2007-03-31	221
2007-06-30	162
2007-09-30	186
2007-12-31	164
2008-03-31	1360
2008-06-30	1353
2008-09-30	1303
2008-12-31	1284
2009-03-31	1286
2009-06-30	1253
2009-09-30	22
2009-12-31	23
2010-03-31	6
2010-06-30	11
2010-09-30	7
2010-12-31	35
2011-03-31	26
2011-06-30	26
2011-09-30	26
2011-12-31	17
2012-03-31	9
2012-06-30	7
2012-09-30	23
2012-12-31	14
2013-03-31	12
2013-06-30	12
2013-09-30	44
2013-12-31	12
2014-03-31	11
2014-06-30	11
2014-09-30	10
2014-12-31	11
2015-03-31	9
2015-06-30	107