Quarter	US dollars
1999-09-30	31637
1999-12-31	30161
2000-03-31	32469
2000-06-30	28875
2000-09-30	31186
2000-12-31	30676
2001-03-31	29016
2001-06-30	25723
2001-09-30	30291
2001-12-31	29406
2002-03-31	29415
2002-06-30	28637
2002-09-30	29899
2002-12-31	28228
2003-03-31	29888
2003-06-30	31843
2003-09-30	32107
2003-12-31	31481
2004-03-31	38634
2004-06-30	35578
2004-09-30	40049
2004-12-31	39416
2005-03-31	41577
2005-06-30	37694
2005-09-30	43868
2005-12-31	39978
2006-03-31	41262
2006-06-30	43955
2006-09-30	43875
2006-12-31	44937
2007-03-31	45039
2007-06-30	47632
2007-09-30	54973
2007-12-31	54330
2008-03-31	67068
2008-06-30	69755
2008-09-30	70028
2008-12-31	61062
2009-03-31	58508
2009-06-30	57244
2009-09-30	62096
2009-12-31	66979
2010-03-31	68572
2010-06-30	71807
2010-09-30	79867
2010-12-31	81876
2011-03-31	91974
2011-06-30	96042
2011-09-30	92539
2011-12-31	94045
2012-03-31	97017
2012-06-30	97758
2012-09-30	102386
2012-12-31	103019
2013-03-31	106001
2013-06-30	101132
2013-09-30	111188
2013-12-31	113913
2014-03-31	123592
2014-06-30	123555
2014-09-30	124023
2014-12-31	112794
2015-03-31	107041
2015-06-30	112807
2015-09-30	107382
2015-12-31	94190
2016-03-31	96452
2016-06-30	101288
2016-09-30	97886
2016-12-31	93075
2017-03-31	98443
2017-06-30	103807
2017-09-30	107300
2017-12-31	109761
2018-03-31	110576
2018-06-30	109803
2018-09-30	112600
2018-12-31	116970
2019-03-31	124571
2019-06-30	121154
2019-09-30	118167
2019-12-31	123186
2020-03-31	124598
2020-06-30	131207
2020-09-30	138500
2020-12-31	148856
2021-03-31	150385
2021-06-30	150324
2021-09-30	156050
2021-12-31	158564
2022-03-31	160378
2022-06-30	158366
2022-09-30	154888
2022-12-31	164198
2023-03-31	168231
2023-06-30	166670
2023-09-30	162088