Quarter	US dollars
1999-09-30	3028
1999-12-31	1497
2000-03-31	1808
2000-06-30	1277
2000-09-30	1453
2000-12-31	1761
2001-03-31	971
2001-06-30	952
2001-09-30	853
2001-12-31	694
2002-03-31	992
2002-06-30	921
2002-09-30	1209
2002-12-31	2368
2003-03-31	2897
2003-06-30	3581
2003-09-30	3536
2003-12-31	4669
2004-03-31	4158
2004-06-30	5912
2004-09-30	8707
2004-12-31	10322
2005-03-31	11438
2005-06-30	15492
2005-09-30	15473
2005-12-31	15409
2006-03-31	14427
2006-06-30	14304
2006-09-30	15180
2006-12-31	15628
2007-03-31	12795
2007-06-30	14251
2007-09-30	15439
2007-12-31	19637
2008-03-31	19095
2008-06-30	9402
2008-09-30	33736
2008-12-31	35654
2009-03-31	16789
2009-06-30	8325
2009-09-30	7091
2009-12-31	6222
2010-03-31	8384
2010-06-30	10539
2010-09-30	9962
2010-12-31	13037
2011-03-31	11107
2011-06-30	9201
2011-09-30	13617
2011-12-31	13196
2012-03-31	12875
2012-06-30	15247
2012-09-30	16558
2012-12-31	17132
2013-03-31	14704
2013-06-30	14018
2013-09-30	10362
2013-12-31	9793
2014-03-31	7576
2014-06-30	9684
2014-09-30	9608
2014-12-31	9741
2015-03-31	10124
2015-06-30	8761
2015-09-30	6168
2015-12-31	6885
2016-03-31	7681
2016-06-30	4676
2016-09-30	5177
2016-12-31	3583
2017-03-31	1537
2017-06-30	2689
2017-09-30	3155
2017-12-31	6787
2018-03-31	4811
2018-06-30	5207
2018-09-30	2401
2018-12-31	3614
2019-03-31	988
2019-06-30	1346
2019-09-30	3040
2019-12-31	3472
2020-03-31	1278
2020-06-30	826
2020-09-30	1583
2020-12-31	2323
2021-03-31	1270
2021-06-30	913
2021-09-30	1084
2021-12-31	2012
2022-03-31	2259
2022-06-30	2196
2022-09-30	1261
2022-12-31	1099
2023-03-31	2191
2023-06-30	4331
2023-09-30	4881
2023-12-31	4687