Quarter	US dollars
1999-03-31	54
1999-06-30	51
1999-09-30	45
1999-12-31	33
2000-03-31	36
2000-06-30	30
2000-09-30	37
2000-12-31	39
2001-03-31	35
2001-06-30	33
2001-09-30	39
2001-12-31	43
2002-03-31	42
2002-06-30	35
2002-09-30	38
2002-12-31	36
2003-03-31	34
2003-06-30	67
2003-09-30	44
2003-12-31	37
2004-03-31	156
2004-06-30	94
2004-09-30	45
2004-12-31	55
2005-03-31	59
2005-06-30	47
2005-09-30	49
2005-12-31	52
2006-03-31	80
2006-06-30	117
2006-09-30	69
2006-12-31	72
2007-03-31	72
2007-06-30	64
2007-09-30	233
2007-12-31	155
2008-03-31	94
2008-06-30	140
2008-09-30	73
2008-12-31	125
2009-03-31	121
2009-06-30	143
2009-09-30	191
2009-12-31	330
2010-03-31	330
2010-06-30	267
2010-09-30	337
2010-12-31	243
2011-03-31	336
2011-06-30	327
2011-09-30	398
2011-12-31	363
2012-03-31	294
2012-06-30	275
2012-09-30	218
2012-12-31	324
2013-03-31	292
2013-06-30	276
2013-09-30	276
2013-12-31	300
2014-03-31	279
2014-06-30	278
2014-09-30	232
2014-12-31	167
2015-03-31	182
2015-06-30	265
2015-09-30	165
2015-12-31	196
2016-03-31	157
2016-06-30	191
2016-09-30	145
2016-12-31	166
2017-03-31	133
2017-06-30	196
2017-09-30	154
2017-12-31	190
2018-03-31	190
2018-06-30	198
2018-09-30	178
2018-12-31	210
2019-03-31	167
2019-06-30	245
2019-09-30	158
2019-12-31	181
2020-03-31	169
2020-06-30	292
2020-09-30	219
2020-12-31	246
2021-03-31	182
2021-06-30	249
2021-09-30	201
2021-12-31	183
2022-03-31	159
2022-06-30	220
2022-09-30	132
2022-12-31	234
2023-03-31	142
2023-06-30	158
2023-09-30	122