Quarter	US dollars
1999-03-31	32
1999-06-30	40
1999-09-30	34
1999-12-31	31
2000-03-31	55
2000-06-30	57
2000-09-30	60
2000-12-31	83
2001-03-31	88
2001-06-30	94
2001-09-30	120
2001-12-31	126
2002-03-31	159
2002-06-30	184
2002-09-30	154
2002-12-31	132
2003-03-31	80
2003-06-30	53
2003-09-30	80
2003-12-31	102
2004-03-31	103
2004-06-30	90
2004-09-30	108
2004-12-31	116
2005-03-31	130
2005-06-30	136
2005-09-30	107
2005-12-31	107
2006-03-31	121
2006-06-30	200
2006-09-30	154
2006-12-31	222
2007-03-31	239
2007-06-30	253
2007-09-30	241
2007-12-31	210
2008-03-31	204
2008-06-30	215
2008-09-30	303
2008-12-31	212
2009-03-31	184
2009-06-30	190
2009-09-30	247
2009-12-31	255
2010-03-31	263
2010-06-30	240
2010-09-30	239
2010-12-31	246
2011-03-31	248
2011-06-30	547
2011-09-30	280
2011-12-31	220
2012-03-31	232
2012-06-30	257
2012-09-30	223
2012-12-31	215
2013-03-31	190
2013-06-30	224
2013-09-30	273
2013-12-31	277
2014-03-31	283
2014-06-30	206
2014-09-30	166
2014-12-31	152
2015-03-31	158
2015-06-30	160
2015-09-30	180
2015-12-31	167
2016-03-31	151
2016-06-30	167
2016-09-30	70
2016-12-31	70
2017-03-31	70
2017-06-30	34
2017-09-30	41
2017-12-31	49
2018-03-31	33
2018-06-30	57
2018-09-30	21
2018-12-31	54
2019-03-31	25
2019-06-30	11
2019-09-30	18
2019-12-31	26
2020-03-31	19
2020-06-30	23
2020-09-30	5
2020-12-31	4
2021-03-31	17
2021-06-30	29
2021-09-30	25
2021-12-31	7
2022-03-31	-6
2022-06-30	4
2022-09-30	17
2022-12-31	29
2023-03-31	58
2023-06-30	45
2023-09-30	48