Quarter	US dollars
1999-09-30	1024
1999-12-31	1482
2000-03-31	815
2000-06-30	1236
2000-09-30	1153
2000-12-31	1360
2001-03-31	1867
2001-06-30	1221
2001-09-30	1147
2001-12-31	1387
2002-03-31	1351
2002-06-30	3255
2002-09-30	1851
2002-12-31	1808
2003-03-31	1993
2003-06-30	1942
2003-09-30	2524
2003-12-31	2319
2004-03-31	2867
2004-06-30	2492
2004-09-30	2220
2004-12-31	4402
2005-03-31	4127
2005-06-30	4673
2005-09-30	4984
2005-12-31	4259
2006-03-31	5432
2006-06-30	8468
2006-09-30	7572
2006-12-31	4869
2007-03-31	14064
2007-06-30	16741
2007-09-30	16937
2007-12-31	18543
2008-03-31	31981
2008-06-30	44379
2008-09-30	49510
2008-12-31	52438
2009-03-31	48184
2009-06-30	36809
2009-09-30	30436
2009-12-31	27597
2010-03-31	27737
2010-06-30	32026
2010-09-30	31562
2010-12-31	31426
2011-03-31	29027
2011-06-30	37356
2011-09-30	36464
2011-12-31	37068
2012-03-31	26035
2012-06-30	30773
2012-09-30	23313
2012-12-31	19565
2013-03-31	20403
2013-06-30	23157
2013-09-30	26101
2013-12-31	26030
2014-03-31	19989
2014-06-30	19253
2014-09-30	18436
2014-12-31	20635
2015-03-31	20504
2015-06-30	17443
2015-09-30	23313
2015-12-31	17729
2016-03-31	17505
2016-06-30	17839
2016-09-30	14234
2016-12-31	14407
2017-03-31	12116
2017-06-30	9084
2017-09-30	8635
2017-12-31	8914
2018-03-31	9281
2018-06-30	10782
2018-09-30	10232
2018-12-31	9192
2019-03-31	8374
2019-06-30	9101
2019-09-30	11860
2019-12-31	7962
2020-03-31	17621
2020-06-30	11211
2020-09-30	11277
2020-12-31	14794
2021-03-31	12324
2021-06-30	11228
2021-09-30	11945
2021-12-31	10645
2022-03-31	13017
2022-06-30	20036
2022-09-30	31486
2022-12-31	16802
2023-03-31	11847
2023-06-30	15143
2023-09-30	17537