Quarter	US dollars
1999-03-31	1258
1999-06-30	764
1999-09-30	563
1999-12-31	1011
2000-03-31	1376
2000-06-30	1254
2000-09-30	1170
2000-12-31	1522
2001-03-31	1713
2001-06-30	1638
2001-09-30	1839
2001-12-31	1588
2002-03-31	1713
2002-06-30	1323
2002-09-30	1288
2002-12-31	1142
2003-03-31	792
2003-06-30	782
2003-09-30	880
2003-12-31	1283
2004-03-31	590
2004-06-30	820
2004-09-30	648
2004-12-31	733
2005-03-31	444
2005-06-30	398
2005-09-30	549
2005-12-31	1050
2006-03-31	1275
2006-06-30	1577
2006-09-30	2174
2006-12-31	1529
2007-03-31	1564
2007-06-30	1388
2007-09-30	1961
2007-12-31	1921
2008-03-31	3894
2008-06-30	2765
2008-09-30	2432
2008-12-31	1998
2009-03-31	1609
2009-06-30	1116
2009-09-30	1462
2009-12-31	5105
2010-03-31	5284
2010-06-30	3548
2010-09-30	3870
2010-12-31	2198
2011-03-31	2065
2011-06-30	1735
2011-09-30	1073
2011-12-31	1013
2012-03-31	918
2012-06-30	785
2012-09-30	167
2012-12-31	215
2013-03-31	112
2013-06-30	45
2013-09-30	51
2013-12-31	233
2014-03-31	251
2014-06-30	460
2014-09-30	299
2014-12-31	247
2015-03-31	129
2015-06-30	162
2015-09-30	197
2015-12-31	141
2016-03-31	235
2016-06-30	416
2016-09-30	748
2016-12-31	571
2017-03-31	435
2017-06-30	24
2017-09-30	171
2017-12-31	238
2018-03-31	63
2018-06-30	21
2018-09-30	127
2018-12-31	33
2019-03-31	33
2019-06-30	11
2019-09-30	9
2019-12-31	2
2020-03-31	19
2020-06-30	33
2020-09-30	11
2020-12-31	59
2021-03-31	57
2021-06-30	96
2021-09-30	53
2021-12-31	41
2022-03-31	20
2022-06-30	48
2022-09-30	46
2022-12-31	8
2023-03-31	6
2023-06-30	2
2023-09-30	7