Quarter	US dollars
1999-03-31	13
1999-06-30	14
1999-09-30	20
1999-12-31	22
2000-03-31	26
2000-06-30	30
2000-09-30	29
2000-12-31	29
2001-03-31	31
2001-06-30	31
2001-09-30	34
2001-12-31	33
2002-03-31	34
2002-06-30	41
2002-09-30	51
2002-12-31	52
2003-03-31	60
2003-06-30	63
2003-09-30	66
2003-12-31	50
2004-03-31	54
2004-06-30	83
2004-09-30	66
2004-12-31	67
2005-03-31	72
2005-06-30	65
2005-09-30	96
2005-12-31	101
2006-03-31	87
2006-06-30	84
2006-09-30	58
2006-12-31	209
2007-03-31	234
2007-06-30	263
2007-09-30	204
2007-12-31	281
2008-03-31	280
2008-06-30	287
2008-09-30	249
2008-12-31	33
2009-03-31	262
2009-06-30	261
2009-09-30	292
2009-12-31	279
2010-03-31	275
2010-06-30	253
2010-09-30	268
2010-12-31	336
2011-03-31	347
2011-06-30	399
2011-09-30	395
2011-12-31	408
2012-03-31	445
2012-06-30	443
2012-09-30	435
2012-12-31	448
2013-03-31	131
2013-06-30	71
2013-09-30	67
2013-12-31	68
2014-03-31	60
2014-06-30	46
2014-09-30	36
2014-12-31	18
2015-03-31	18
2015-06-30	18
2015-09-30	21
2015-12-31	21
2016-03-31	15
2016-06-30	15
2016-09-30	14
2016-12-31	14
2017-03-31	14
2017-06-30	14
2017-09-30	15
2017-12-31	15
2018-03-31	17
2018-06-30	16
2018-09-30	15
2018-12-31	15
2019-03-31	16
2019-06-30	15
2019-09-30	15
2019-12-31	17
2020-03-31	16
2020-06-30	18
2020-09-30	18
2020-12-31	19
2021-03-31	56
2021-06-30	70
2021-09-30	122
2021-12-31	68
2022-03-31	41
2022-06-30	68
2022-09-30	61
2022-12-31	52
2023-03-31	112
2023-06-30	118
2023-09-30	86