Quarter	US dollars
1999-03-31	206
1999-06-30	179
1999-09-30	326
1999-12-31	70
2000-03-31	68
2000-06-30	85
2000-09-30	113
2000-12-31	136
2001-03-31	167
2001-06-30	130
2001-09-30	130
2001-12-31	239
2002-03-31	216
2002-06-30	609
2002-09-30	1365
2002-12-31	1621
2003-03-31	1863
2003-06-30	2403
2003-09-30	2829
2003-12-31	2140
2004-03-31	2988
2004-06-30	4212
2004-09-30	4979
2004-12-31	4143
2005-03-31	6100
2005-06-30	7550
2005-09-30	7870
2005-12-31	9700
2006-03-31	7680
2006-06-30	8829
2006-09-30	10965
2006-12-31	11803
2007-03-31	11694
2007-06-30	13498
2007-09-30	15239
2007-12-31	15155
2008-03-31	14646
2008-06-30	15038
2008-09-30	13860
2008-12-31	10033
2009-03-31	6753
2009-06-30	8085
2009-09-30	7023
2009-12-31	7706
2010-03-31	7563
2010-06-30	9945
2010-09-30	11471
2010-12-31	11893
2011-03-31	14025
2011-06-30	12452
2011-09-30	9766
2011-12-31	7902
2012-03-31	8266
2012-06-30	7526
2012-09-30	5246
2012-12-31	3028
2013-03-31	3412
2013-06-30	2387
2013-09-30	1951
2013-12-31	2764
2014-03-31	963
2014-06-30	1712
2014-09-30	2349
2014-12-31	336
2015-03-31	1678
2015-06-30	1283
2015-09-30	3415
2015-12-31	3378
2016-03-31	1333
2016-06-30	426
2016-09-30	373
2016-12-31	788
2017-03-31	607
2017-06-30	501
2017-09-30	388
2017-12-31	488
2018-03-31	624
2018-06-30	1041
2018-09-30	1311
2018-12-31	2010
2019-03-31	2175
2019-06-30	1135
2019-09-30	1681
2019-12-31	1604
2020-03-31	603
2020-06-30	566
2020-09-30	799
2020-12-31	662
2021-03-31	755
2021-06-30	876
2021-09-30	1002
2021-12-31	1030
2022-03-31	1743
2022-06-30	778
2022-09-30	1885
2022-12-31	449
2023-03-31	584
2023-06-30	455
2023-09-30	584