Quarter	US dollars
1999-03-31	25
1999-06-30	29
1999-09-30	31
1999-12-31	33
2000-03-31	36
2000-06-30	50
2000-09-30	54
2000-12-31	57
2001-03-31	69
2001-06-30	59
2001-09-30	55
2001-12-31	56
2002-03-31	41
2002-06-30	40
2002-09-30	38
2002-12-31	42
2003-03-31	50
2003-06-30	57
2003-09-30	54
2003-12-31	53
2004-03-31	27
2004-06-30	34
2004-09-30	31
2004-12-31	29
2005-03-31	33
2005-06-30	40
2005-09-30	34
2005-12-31	32
2006-03-31	32
2006-06-30	36
2006-09-30	38
2006-12-31	36
2007-03-31	21
2007-06-30	18
2007-09-30	17
2007-12-31	20
2008-03-31	20
2008-06-30	32
2008-09-30	43
2008-12-31	47
2009-03-31	36
2009-06-30	32
2009-09-30	39
2009-12-31	44
2010-03-31	44
2010-06-30	70
2010-09-30	91
2010-12-31	111
2011-03-31	107
2011-06-30	145
2011-09-30	148
2011-12-31	178
2012-03-31	201
2012-06-30	203
2012-09-30	150
2012-12-31	237
2013-03-31	268
2013-06-30	260
2013-09-30	254
2013-12-31	235
2014-03-31	220
2014-06-30	221
2014-09-30	226
2014-12-31	221
2015-03-31	240
2015-06-30	213
2015-09-30	204
2015-12-31	175
2016-03-31	145
2016-06-30	163
2016-09-30	169
2016-12-31	170
2017-03-31	178
2017-06-30	207
2017-09-30	223
2017-12-31	189
2018-03-31	224
2018-06-30	276
2018-09-30	250
2018-12-31	228
2019-03-31	236
2019-06-30	219
2019-09-30	233
2019-12-31	249
2020-03-31	246
2020-06-30	320
2020-09-30	330
2020-12-31	377
2021-03-31	376
2021-06-30	410
2021-09-30	441
2021-12-31	378
2022-03-31	373
2022-06-30	326
2022-09-30	338
2022-12-31	308
2023-03-31	311
2023-06-30	281
2023-09-30	314