Quarter	US dollars
1999-03-31	28499
1999-06-30	29581
1999-09-30	29041
1999-12-31	26957
2000-03-31	36437
2000-06-30	36510
2000-09-30	38830
2000-12-31	36957
2001-03-31	39774
2001-06-30	43264
2001-09-30	42670
2001-12-31	37523
2002-03-31	34913
2002-06-30	37560
2002-09-30	36097
2002-12-31	36913
2003-03-31	38003
2003-06-30	39128
2003-09-30	43156
2003-12-31	52773
2004-03-31	66887
2004-06-30	73474
2004-09-30	78069
2004-12-31	75382
2005-03-31	83237
2005-06-30	70309
2005-09-30	82955
2005-12-31	72546
2006-03-31	84555
2006-06-30	84802
2006-09-30	90381
2006-12-31	91820
2007-03-31	105397
2007-06-30	110606
2007-09-30	117567
2007-12-31	111174
2008-03-31	95647
2008-06-30	67501
2008-09-30	58724
2008-12-31	49920
2009-03-31	57950
2009-06-30	61010
2009-09-30	53943
2009-12-31	41227
2010-03-31	47253
2010-06-30	56926
2010-09-30	54152
2010-12-31	62078
2011-03-31	55938
2011-06-30	55971
2011-09-30	62713
2011-12-31	63733
2012-03-31	67198
2012-06-30	59514
2012-09-30	75788
2012-12-31	77039
2013-03-31	82835
2013-06-30	70406
2013-09-30	80049
2013-12-31	98466
2014-03-31	101717
2014-06-30	120910
2014-09-30	120083
2014-12-31	116111
2015-03-31	113566
2015-06-30	115502
2015-09-30	111945
2015-12-31	115857
2016-03-31	131380
2016-06-30	123485
2016-09-30	124017
2016-12-31	104974
2017-03-31	117747
2017-06-30	116465
2017-09-30	116196
2017-12-31	120073
2018-03-31	113724
2018-06-30	102649
2018-09-30	115201
2018-12-31	117282
2019-03-31	148257
2019-06-30	141185
2019-09-30	126989
2019-12-31	116270
2020-03-31	147619
2020-06-30	123394
2020-09-30	128022
2020-12-31	142047
2021-03-31	174831
2021-06-30	175531
2021-09-30	182883
2021-12-31	186994
2022-03-31	196895
2022-06-30	184711
2022-09-30	150927
2022-12-31	138730
2023-03-31	127652
2023-06-30	111736
2023-09-30	125315