Quarter	US dollars
1999-09-30	13257
1999-12-31	15478
2000-03-31	17469
2000-06-30	15971
2000-09-30	9955
2000-12-31	13291
2001-03-31	12365
2001-06-30	11444
2001-09-30	13581
2001-12-31	12338
2002-03-31	15873
2002-06-30	20047
2002-09-30	20793
2002-12-31	18838
2003-03-31	21479
2003-06-30	22120
2003-09-30	25833
2003-12-31	27517
2004-03-31	38103
2004-06-30	37714
2004-09-30	38026
2004-12-31	41408
2005-03-31	48273
2005-06-30	49864
2005-09-30	51270
2005-12-31	40242
2006-03-31	47813
2006-06-30	40718
2006-09-30	43598
2006-12-31	45316
2007-03-31	51900
2007-06-30	51689
2007-09-30	59138
2007-12-31	46444
2008-03-31	46748
2008-06-30	49719
2008-09-30	44645
2008-12-31	40033
2009-03-31	38102
2009-06-30	37845
2009-09-30	38175
2009-12-31	30725
2010-03-31	25972
2010-06-30	29153
2010-09-30	30470
2010-12-31	25724
2011-03-31	32108
2011-06-30	18427
2011-09-30	18319
2011-12-31	19032
2012-03-31	23078
2012-06-30	20487
2012-09-30	17849
2012-12-31	17731
2013-03-31	16107
2013-06-30	16409
2013-09-30	14529
2013-12-31	13751
2014-03-31	16189
2014-06-30	21007
2014-09-30	15077
2014-12-31	14333
2015-03-31	14434
2015-06-30	14063
2015-09-30	12002
2015-12-31	12172
2016-03-31	10545
2016-06-30	9654
2016-09-30	9502
2016-12-31	8488
2017-03-31	8770
2017-06-30	8716
2017-09-30	9061
2017-12-31	8972
2018-03-31	11805
2018-06-30	12539
2018-09-30	10718
2018-12-31	9185
2019-03-31	10368
2019-06-30	8771
2019-09-30	8969
2019-12-31	7532
2020-03-31	10366
2020-06-30	8776
2020-09-30	7367
2020-12-31	7432
2021-03-31	7838
2021-06-30	7578
2021-09-30	8094
2021-12-31	6283
2022-03-31	7874
2022-06-30	7139
2022-09-30	8447
2022-12-31	6974
2023-03-31	6547
2023-06-30	8694
2023-09-30	9034