Quarter	US dollars
1999-03-31	13266
1999-06-30	14109
1999-09-30	10219
1999-12-31	20520
2000-03-31	9738
2000-06-30	10497
2000-09-30	10646
2000-12-31	10583
2001-03-31	8385
2001-06-30	9335
2001-09-30	9943
2001-12-31	20733
2002-03-31	9770
2002-06-30	10884
2002-09-30	14570
2002-12-31	13717
2003-03-31	13146
2003-06-30	20819
2003-09-30	16100
2003-12-31	18409
2004-03-31	31898
2004-06-30	23920
2004-09-30	35917
2004-12-31	23541
2005-03-31	13868
2005-06-30	36447
2005-09-30	24160
2005-12-31	28920
2006-03-31	37587
2006-06-30	14103
2006-09-30	32523
2006-12-31	32833
2007-03-31	57627
2007-06-30	48094
2007-09-30	32448
2007-12-31	39599
2008-03-31	91546
2008-06-30	47168
2008-09-30	48135
2008-12-31	76222
2009-03-31	109389
2009-06-30	71301
2009-09-30	24788
2009-12-31	24848
2010-03-31	20977
2010-06-30	21991
2010-09-30	23259
2010-12-31	21560
2011-03-31	23219
2011-06-30	25640
2011-09-30	250719
2011-12-31	245733
2012-03-31	197401
2012-06-30	16533
2012-09-30	15934
2012-12-31	17568
2013-03-31	17164
2013-06-30	13405
2013-09-30	13109
2013-12-31	15058
2014-03-31	15920
2014-06-30	18388
2014-09-30	19108
2014-12-31	19639
2015-03-31	21731
2015-06-30	19778
2015-09-30	18958
2015-12-31	17093
2016-03-31	18134
2016-06-30	17825
2016-09-30	18811
2016-12-31	16198
2017-03-31	18403
2017-06-30	16636
2017-09-30	17730
2017-12-31	19148
2018-03-31	19306
2018-06-30	20190
2018-09-30	19328
2018-12-31	17795
2019-03-31	16187
2019-06-30	16380
2019-09-30	14603
2019-12-31	14422
2020-03-31	13431
2020-06-30	12027
2020-09-30	11790
2020-12-31	11227
2021-03-31	13261
2021-06-30	13005
2021-09-30	11523
2021-12-31	11009
2022-03-31	11114
2022-06-30	11279
2022-09-30	12907
2022-12-31	6010
2023-03-31	6387
2023-06-30	5802
2023-09-30	6180