Quarter	US dollars
1999-03-31	32794
1999-06-30	29043
1999-09-30	28580
1999-12-31	34925
2000-03-31	35861
2000-06-30	35503
2000-09-30	30792
2000-12-31	46781
2001-03-31	42403
2001-06-30	31676
2001-09-30	24872
2001-12-31	36336
2002-03-31	28397
2002-06-30	28028
2002-09-30	27745
2002-12-31	29081
2003-03-31	47275
2003-06-30	47907
2003-09-30	40999
2003-12-31	47424
2004-03-31	75030
2004-06-30	61931
2004-09-30	68264
2004-12-31	86862
2005-03-31	75939
2005-06-30	79495
2005-09-30	57484
2005-12-31	69723
2006-03-31	87555
2006-06-30	79086
2006-09-30	62642
2006-12-31	57369
2007-03-31	75044
2007-06-30	66500
2007-09-30	78879
2007-12-31	117683
2008-03-31	132768
2008-06-30	115411
2008-09-30	81669
2008-12-31	79548
2009-03-31	49598
2009-06-30	56386
2009-09-30	49554
2009-12-31	47655
2010-03-31	36769
2010-06-30	60380
2010-09-30	62926
2010-12-31	60910
2011-03-31	41322
2011-06-30	35272
2011-09-30	45783
2011-12-31	51807
2012-03-31	56408
2012-06-30	63755
2012-09-30	40002
2012-12-31	55164
2013-03-31	39521
2013-06-30	43032
2013-09-30	50421
2013-12-31	41906
2014-03-31	54971
2014-06-30	56438
2014-09-30	61715
2014-12-31	85216
2015-03-31	87484
2015-06-30	66178
2015-09-30	65680
2015-12-31	62189
2016-03-31	66776
2016-06-30	63935
2016-09-30	96264
2016-12-31	89444
2017-03-31	59638
2017-06-30	45940
2017-09-30	107043
2017-12-31	92857
2018-03-31	52902
2018-06-30	43785
2018-09-30	21961
2018-12-31	33335
2019-03-31	30937
2019-06-30	31486
2019-09-30	29349
2019-12-31	43507
2020-03-31	23833
2020-06-30	20413
2020-09-30	14260
2020-12-31	16882
2021-03-31	18198
2021-06-30	17964
2021-09-30	11220
2021-12-31	12565
2022-03-31	13971
2022-06-30	21681
2022-09-30	17965
2022-12-31	2484
2023-03-31	5324
2023-06-30	1575
2023-09-30	1921