Quarter	US dollars
1999-09-30	21
1999-12-31	50
2000-03-31	73
2000-06-30	139
2000-09-30	275
2000-12-31	417
2001-03-31	378
2001-06-30	377
2001-09-30	497
2001-12-31	403
2002-03-31	197
2002-06-30	403
2002-09-30	390
2002-12-31	481
2003-03-31	550
2003-06-30	639
2003-09-30	676
2003-12-31	949
2004-03-31	836
2004-06-30	751
2004-09-30	713
2004-12-31	995
2005-03-31	645
2005-06-30	706
2005-09-30	456
2005-12-31	1277
2006-03-31	1268
2006-06-30	1635
2006-09-30	1792
2006-12-31	1840
2007-03-31	2034
2007-06-30	1984
2007-09-30	1357
2007-12-31	3888
2008-03-31	4832
2008-06-30	1907
2008-09-30	2226
2008-12-31	3890
2009-03-31	3310
2009-06-30	3582
2009-09-30	5953
2009-12-31	3018
2010-03-31	1993
2010-06-30	2590
2010-09-30	3146
2010-12-31	3295
2011-03-31	1765
2011-06-30	1925
2011-09-30	2089
2011-12-31	2134
2012-03-31	2055
2012-06-30	1736
2012-09-30	1466
2012-12-31	1570
2013-03-31	1422
2013-06-30	1169
2013-09-30	1171
2013-12-31	995
2014-03-31	1366
2014-06-30	1523
2014-09-30	1274
2014-12-31	1706
2015-03-31	1373
2015-06-30	1622
2015-09-30	1778
2015-12-31	1464
2016-03-31	1126
2016-06-30	1128
2016-09-30	1021
2016-12-31	749
2017-03-31	747
2017-06-30	776
2017-09-30	640
2017-12-31	744
2018-03-31	744
2018-06-30	694
2018-09-30	745
2018-12-31	847
2019-03-31	895
2019-06-30	1362
2019-09-30	4221
2019-12-31	3100
2020-03-31	6703
2020-06-30	1969
2020-09-30	1880
2020-12-31	3415
2021-03-31	2031
2021-06-30	1903
2021-09-30	1861
2021-12-31	2013
2022-03-31	2414
2022-06-30	2986
2022-09-30	4366
2022-12-31	2662
2023-03-31	1556
2023-06-30	1537
2023-09-30	1532