Quarter	US dollars
1999-03-31	39
1999-06-30	51
1999-09-30	55
1999-12-31	50
2000-03-31	47
2000-06-30	51
2000-09-30	58
2000-12-31	102
2001-03-31	69
2001-06-30	56
2001-09-30	46
2001-12-31	36
2002-03-31	36
2002-06-30	23
2002-09-30	19
2002-12-31	19
2003-03-31	17
2003-06-30	19
2003-09-30	16
2003-12-31	12
2004-03-31	10
2004-06-30	11
2004-09-30	11
2004-12-31	11
2005-03-31	11
2005-06-30	12
2005-09-30	11
2005-12-31	12
2006-03-31	12
2006-06-30	11
2006-09-30	22
2006-12-31	12
2007-03-31	33
2007-06-30	43
2007-09-30	15
2007-12-31	37
2008-03-31	84
2008-06-30	80
2008-09-30	94
2008-12-31	84
2009-03-31	76
2009-06-30	59
2009-09-30	59
2009-12-31	50
2010-03-31	29
2010-06-30	32
2010-09-30	41
2010-12-31	50
2011-03-31	55
2011-06-30	54
2011-09-30	28
2011-12-31	39
2012-03-31	35
2012-06-30	21
2012-09-30	22
2012-12-31	23
2013-03-31	36
2013-06-30	33
2013-09-30	24
2013-12-31	203
2014-03-31	47
2014-06-30	659
2014-09-30	575
2014-12-31	269
2015-03-31	50
2015-06-30	49
2015-09-30	49
2015-12-31	41
2016-03-31	46
2016-06-30	294
2016-09-30	326
2016-12-31	304
2017-03-31	375
2017-06-30	446
2017-09-30	457
2017-12-31	223
2018-03-31	89
2018-06-30	525
2018-09-30	1148
2018-12-31	260
2019-03-31	1108
2019-06-30	384
2019-09-30	308
2019-12-31	310
2020-03-31	118
2020-06-30	99
2020-09-30	219
2020-12-31	122
2021-03-31	155
2021-06-30	185
2021-09-30	198
2021-12-31	232
2022-03-31	199
2022-06-30	235
2022-09-30	353
2022-12-31	363
2023-03-31	344
2023-06-30	252
2023-09-30	250