Quarter	US dollars
1999-03-31	21
1999-06-30	21
1999-09-30	23
1999-12-31	32
2000-03-31	36
2000-06-30	31
2000-09-30	29
2000-12-31	27
2001-03-31	35
2001-06-30	38
2001-09-30	36
2001-12-31	63
2002-03-31	36
2002-06-30	38
2002-09-30	36
2002-12-31	40
2003-03-31	46
2003-06-30	46
2003-09-30	41
2003-12-31	48
2004-03-31	44
2004-06-30	47
2004-09-30	59
2004-12-31	85
2005-03-31	38
2005-06-30	37
2005-09-30	37
2005-12-31	35
2006-03-31	51
2006-06-30	43
2006-09-30	86
2006-12-31	49
2007-03-31	333
2007-06-30	113
2007-09-30	50
2007-12-31	45
2008-03-31	53
2008-06-30	45
2008-09-30	42
2008-12-31	31
2009-03-31	36
2009-06-30	32
2009-09-30	39
2009-12-31	46
2010-03-31	185
2010-06-30	143
2010-09-30	155
2010-12-31	148
2011-03-31	156
2011-06-30	161
2011-09-30	209
2011-12-31	212
2012-03-31	222
2012-06-30	221
2012-09-30	217
2012-12-31	427
2013-03-31	257
2013-06-30	286
2013-09-30	209
2013-12-31	212
2014-03-31	456
2014-06-30	510
2014-09-30	324
2014-12-31	339
2015-03-31	374
2015-06-30	395
2015-09-30	416
2015-12-31	441
2016-03-31	436
2016-06-30	453
2016-09-30	138
2016-12-31	139
2017-03-31	144
2017-06-30	162
2017-09-30	162
2017-12-31	156
2018-03-31	195
2018-06-30	184
2018-09-30	165
2018-12-31	217
2019-03-31	214
2019-06-30	150
2019-09-30	131
2019-12-31	124
2020-03-31	228
2020-06-30	157
2020-09-30	243
2020-12-31	241
2021-03-31	246
2021-06-30	163
2021-09-30	195
2021-12-31	155
2022-03-31	150
2022-06-30	133
2022-09-30	172
2022-12-31	153
2023-03-31	322
2023-06-30	228
2023-09-30	199