Quarter	US dollars
1999-03-31	9699
1999-06-30	9848
1999-09-30	13731
1999-12-31	2698
2000-03-31	18802
2000-06-30	8831
2000-09-30	11736
2000-12-31	9440
2001-03-31	30202
2001-06-30	-18923
2001-09-30	5634
2001-12-31	10632
2002-03-31	2963
2002-06-30	-3316
2002-09-30	6155
2002-12-31	7900
2003-03-31	9533
2003-06-30	14052
2003-09-30	9073
2003-12-31	6525
2004-03-31	49719
2004-06-30	7138
2004-09-30	-13076
2004-12-31	21407
2005-03-31	22746
2005-06-30	15243
2005-09-30	20337
2005-12-31	28901
2006-03-31	24261
2006-06-30	58173
2006-09-30	-14705
2006-12-31	42479
2007-03-31	188677
2007-06-30	1173
2007-09-30	88113
2007-12-31	158919
2008-03-31	31637
2008-06-30	-65234
2008-09-30	39354
2008-12-31	-56937
2009-03-31	20032
2009-06-30	-43644
2009-09-30	-40373
2009-12-31	-38457
2010-03-31	-13511
2010-06-30	-16092
2010-09-30	2024
2010-12-31	-16532
2011-03-31	-45183
2011-06-30	4922
2011-09-30	-29451
2011-12-31	-27708
2012-03-31	48295
2012-06-30	2486
2012-09-30	33651
2012-12-31	-5779
2013-03-31	-32139
2013-06-30	-62
2013-09-30	-13157
2013-12-31	4428
2014-03-31	-13996
2014-06-30	-3018
2014-09-30	-15388
2014-12-31	15602
2015-03-31	3573
2015-06-30	10227
2015-09-30	37084
2015-12-31	-7692
2016-03-31	-12983
2016-06-30	6931
2016-09-30	5314
2016-12-31	15780
2017-03-31	11926
2017-06-30	24257
2017-09-30	-20045
2017-12-31	-6863
2018-03-31	-1077
2018-06-30	-4070
2018-09-30	11370
2018-12-31	-20186
2019-03-31	20230
2019-06-30	-24420
2019-09-30	30030
2019-12-31	4936
2020-03-31	34948
2020-06-30	25396
2020-09-30	18742
2020-12-31	20712
2021-03-31	-22062
2021-06-30	-7613
2021-09-30	21660
2021-12-31	55285
2022-03-31	-23797
2022-06-30	-11491
2022-09-30	17623
2022-12-31	-40885
2023-03-31	-23490
2023-06-30	-16996
2023-09-30	10408