Quarter	US dollars
1999-03-31	52
1999-06-30	56
1999-09-30	44
1999-12-31	40
2000-03-31	80
2000-06-30	74
2000-09-30	118
2000-12-31	125
2001-03-31	91
2001-06-30	94
2001-09-30	100
2001-12-31	105
2002-03-31	80
2002-06-30	100
2002-09-30	147
2002-12-31	313
2003-03-31	299
2003-06-30	378
2003-09-30	512
2003-12-31	504
2004-03-31	538
2004-06-30	493
2004-09-30	523
2004-12-31	951
2005-03-31	1070
2005-06-30	1099
2005-09-30	1245
2005-12-31	1115
2006-03-31	918
2006-06-30	931
2006-09-30	960
2006-12-31	1053
2007-03-31	1515
2007-06-30	1502
2007-09-30	1401
2007-12-31	1471
2008-03-31	1847
2008-06-30	1917
2008-09-30	2020
2008-12-31	1759
2009-03-31	1661
2009-06-30	1964
2009-09-30	2543
2009-12-31	2755
2010-03-31	2751
2010-06-30	3352
2010-09-30	3139
2010-12-31	3722
2011-03-31	3519
2011-06-30	3245
2011-09-30	3324
2011-12-31	3380
2012-03-31	3760
2012-06-30	2626
2012-09-30	2779
2012-12-31	2786
2013-03-31	2930
2013-06-30	2441
2013-09-30	2776
2013-12-31	2691
2014-03-31	1570
2014-06-30	1641
2014-09-30	2132
2014-12-31	1226
2015-03-31	1908
2015-06-30	873
2015-09-30	2361
2015-12-31	1908
2016-03-31	1609
2016-06-30	1458
2016-09-30	1559
2016-12-31	1445
2017-03-31	1736
2017-06-30	1243
2017-09-30	1142
2017-12-31	1139
2018-03-31	806
2018-06-30	451
2018-09-30	657
2018-12-31	655
2019-03-31	647
2019-06-30	783
2019-09-30	501
2019-12-31	621
2020-03-31	620
2020-06-30	356
2020-09-30	501
2020-12-31	575
2021-03-31	822
2021-06-30	651
2021-09-30	871
2021-12-31	1326
2022-03-31	1610
2022-06-30	2106
2022-09-30	2537
2022-12-31	2556
2023-03-31	1997
2023-06-30	2094
2023-09-30	2136