Quarter	US dollars
1999-09-30	3707
1999-12-31	3462
2000-03-31	3281
2000-06-30	3274
2000-09-30	3027
2000-12-31	3238
2001-03-31	3473
2001-06-30	3881
2001-09-30	4620
2001-12-31	5501
2002-03-31	5915
2002-06-30	7251
2002-09-30	7365
2002-12-31	7780
2003-03-31	10011
2003-06-30	10438
2003-09-30	10696
2003-12-31	9234
2004-03-31	11332
2004-06-30	11259
2004-09-30	9057
2004-12-31	9553
2005-03-31	11237
2005-06-30	11696
2005-09-30	11334
2005-12-31	9806
2006-03-31	9117
2006-06-30	8691
2006-09-30	8025
2006-12-31	8451
2007-03-31	8532
2007-06-30	8476
2007-09-30	8927
2007-12-31	8074
2008-03-31	9719
2008-06-30	8920
2008-09-30	6641
2008-12-31	5609
2009-03-31	6987
2009-06-30	6748
2009-09-30	6534
2009-12-31	6484
2010-03-31	7136
2010-06-30	5832
2010-09-30	6194
2010-12-31	6120
2011-03-31	7228
2011-06-30	6454
2011-09-30	6214
2011-12-31	6091
2012-03-31	6762
2012-06-30	5855
2012-09-30	5942
2012-12-31	5929
2013-03-31	5848
2013-06-30	5775
2013-09-30	10703
2013-12-31	10617
2014-03-31	11659
2014-06-30	10506
2014-09-30	10142
2014-12-31	9845
2015-03-31	9272
2015-06-30	8687
2015-09-30	10747
2015-12-31	10286
2016-03-31	10523
2016-06-30	12209
2016-09-30	11128
2016-12-31	10797
2017-03-31	9712
2017-06-30	10123
2017-09-30	10730
2017-12-31	11783
2018-03-31	10461
2018-06-30	8739
2018-09-30	8295
2018-12-31	8384
2019-03-31	6757
2019-06-30	6355
2019-09-30	6229
2019-12-31	9678
2020-03-31	5780
2020-06-30	15784
2020-09-30	16508
2020-12-31	17204
2021-03-31	17063
2021-06-30	14789
2021-09-30	14850
2021-12-31	16011
2022-03-31	14529
2022-06-30	10765
2022-09-30	6198
2022-12-31	6020
2023-03-31	6209
2023-06-30	6360
2023-09-30	6414
2023-12-31	7798