Quarter	US dollars
1999-03-31	33
1999-06-30	34
1999-09-30	44
1999-12-31	35
2000-03-31	39
2000-06-30	37
2000-09-30	30
2000-12-31	29
2001-03-31	35
2001-06-30	35
2001-09-30	42
2001-12-31	35
2002-03-31	34
2002-06-30	54
2002-09-30	55
2002-12-31	52
2003-03-31	47
2003-06-30	41
2003-09-30	82
2003-12-31	62
2004-03-31	68
2004-06-30	81
2004-09-30	105
2004-12-31	53
2005-03-31	96
2005-06-30	56
2005-09-30	82
2005-12-31	85
2006-03-31	95
2006-06-30	116
2006-09-30	125
2006-12-31	91
2007-03-31	121
2007-06-30	116
2007-09-30	100
2007-12-31	99
2008-03-31	122
2008-06-30	127
2008-09-30	106
2008-12-31	106
2009-03-31	177
2009-06-30	169
2009-09-30	150
2009-12-31	122
2010-03-31	150
2010-06-30	141
2010-09-30	166
2010-12-31	125
2011-03-31	140
2011-06-30	140
2011-09-30	120
2011-12-31	96
2012-03-31	122
2012-06-30	97
2012-09-30	127
2012-12-31	255
2013-03-31	363
2013-06-30	347
2013-09-30	403
2013-12-31	446
2014-03-31	360
2014-06-30	269
2014-09-30	305
2014-12-31	340
2015-03-31	269
2015-06-30	276
2015-09-30	281
2015-12-31	276
2016-03-31	278
2016-06-30	281
2016-09-30	263
2016-12-31	253
2017-03-31	253
2017-06-30	250
2017-09-30	261
2017-12-31	257
2018-03-31	242
2018-06-30	233
2018-09-30	220
2018-12-31	217
2019-03-31	63
2019-06-30	69
2019-09-30	42
2019-12-31	51
2020-03-31	43
2020-06-30	37
2020-09-30	46
2020-12-31	42
2021-03-31	30
2021-06-30	32
2021-09-30	30
2021-12-31	27
2022-03-31	37
2022-06-30	24
2022-09-30	23
2022-12-31	73
2023-03-31	78
2023-06-30	56
2023-09-30	42