Quarter	US dollars
1999-03-31	3088
1999-06-30	3365
1999-09-30	4063
1999-12-31	4731
2000-03-31	4604
2000-06-30	4656
2000-09-30	5010
2000-12-31	5313
2001-03-31	6045
2001-06-30	6509
2001-09-30	6368
2001-12-31	6090
2002-03-31	2351
2002-06-30	1923
2002-09-30	2175
2002-12-31	2983
2003-03-31	3637
2003-06-30	4837
2003-09-30	4372
2003-12-31	3611
2004-03-31	3221
2004-06-30	3528
2004-09-30	4091
2004-12-31	3488
2005-03-31	3634
2005-06-30	3148
2005-09-30	5030
2005-12-31	4136
2006-03-31	5411
2006-06-30	4886
2006-09-30	5010
2006-12-31	3158
2007-03-31	2711
2007-06-30	3162
2007-09-30	4288
2007-12-31	4331
2008-03-31	3406
2008-06-30	2872
2008-09-30	5171
2008-12-31	3529
2009-03-31	1090
2009-06-30	1433
2009-09-30	1707
2009-12-31	1317
2010-03-31	1349
2010-06-30	2496
2010-09-30	1743
2010-12-31	2573
2011-03-31	1095
2011-06-30	552
2011-09-30	2542
2011-12-31	2805
2012-03-31	3116
2012-06-30	1315
2012-09-30	1756
2012-12-31	706
2013-03-31	926
2013-06-30	2235
2013-09-30	1563
2013-12-31	1870
2014-03-31	1555
2014-06-30	2192
2014-09-30	2834
2014-12-31	2987
2015-03-31	3585
2015-06-30	3779
2015-09-30	3181
2015-12-31	3632
2016-03-31	3566
2016-06-30	4597
2016-09-30	5114
2016-12-31	4982
2017-03-31	5303
2017-06-30	3664
2017-09-30	3617
2017-12-31	3194
2018-03-31	4025
2018-06-30	4802
2018-09-30	3207
2018-12-31	2740
2019-03-31	2643
2019-06-30	3024
2019-09-30	3507
2019-12-31	2844
2020-03-31	5912
2020-06-30	5490
2020-09-30	4931
2020-12-31	5453
2021-03-31	4860
2021-06-30	6250
2021-09-30	6269
2021-12-31	5437
2022-03-31	7548
2022-06-30	7023
2022-09-30	8594
2022-12-31	7223
2023-03-31	12384
2023-06-30	10313
2023-09-30	9721