Quarter	US dollars
1999-09-30	6764
1999-12-31	7200
2000-03-31	7239
2000-06-30	8421
2000-09-30	9266
2000-12-31	11124
2001-03-31	13307
2001-06-30	11770
2001-09-30	13513
2001-12-31	13169
2002-03-31	10987
2002-06-30	18171
2002-09-30	20197
2002-12-31	24812
2003-03-31	24408
2003-06-30	27700
2003-09-30	27126
2003-12-31	29450
2004-03-31	28403
2004-06-30	22588
2004-09-30	25520
2004-12-31	38089
2005-03-31	34753
2005-06-30	43597
2005-09-30	43054
2005-12-31	35611
2006-03-31	33629
2006-06-30	41881
2006-09-30	35731
2006-12-31	33647
2007-03-31	43182
2007-06-30	59594
2007-09-30	65881
2007-12-31	74507
2008-03-31	112335
2008-06-30	125900
2008-09-30	110292
2008-12-31	241343
2009-03-31	157233
2009-06-30	118927
2009-09-30	116363
2009-12-31	103221
2010-03-31	99166
2010-06-30	115065
2010-09-30	128983
2010-12-31	107146
2011-03-31	93994
2011-06-30	100417
2011-09-30	134213
2011-12-31	127063
2012-03-31	124302
2012-06-30	120420
2012-09-30	86896
2012-12-31	94960
2013-03-31	87197
2013-06-30	69347
2013-09-30	63440
2013-12-31	60263
2014-03-31	66355
2014-06-30	75926
2014-09-30	78578
2014-12-31	81310
2015-03-31	88948
2015-06-30	70236
2015-09-30	71112
2015-12-31	63533
2016-03-31	73342
2016-06-30	74954
2016-09-30	69894
2016-12-31	60422
2017-03-31	54350
2017-06-30	53699
2017-09-30	48526
2017-12-31	48570
2018-03-31	44768
2018-06-30	31097
2018-09-30	41757
2018-12-31	41681
2019-03-31	35687
2019-06-30	40139
2019-09-30	43778
2019-12-31	45770
2020-03-31	59015
2020-06-30	54218
2020-09-30	53858
2020-12-31	53963
2021-03-31	45757
2021-06-30	37885
2021-09-30	35673
2021-12-31	34713
2022-03-31	34192
2022-06-30	33406
2022-09-30	39793
2022-12-31	33778
2023-03-31	29938
2023-06-30	32148
2023-09-30	33581