Quarter	US dollars
2004-12-31	16427
2005-03-31	17305
2005-06-30	17163
2005-09-30	18841
2005-12-31	18759
2006-03-31	19371
2006-06-30	20639
2006-09-30	20943
2006-12-31	21308
2007-03-31	24083
2007-06-30	25261
2007-09-30	23654
2007-12-31	25434
2008-03-31	27302
2008-06-30	27913
2008-09-30	26300
2008-12-31	25832
2009-03-31	24912
2009-06-30	25919
2009-09-30	26176
2009-12-31	26636
2010-03-31	28385
2010-06-30	27781
2010-09-30	31094
2010-12-31	32692
2011-03-31	34513
2011-06-30	34708
2011-09-30	33486
2011-12-31	37125
2012-03-31	34974
2012-06-30	34343
2012-09-30	36014
2012-12-31	37932
2013-03-31	38059
2013-06-30	38365
2013-09-30	37130
2013-12-31	37251
2014-03-31	38028
2014-06-30	38484
2014-09-30	38763
2014-12-31	35541
2015-03-31	35208
2015-06-30	32221
2015-09-30	28376
2015-12-31	27740
2016-03-31	30063
2016-06-30	28433
2016-09-30	27876
2016-12-31	25986
2017-03-31	26566
2017-06-30	27098
2017-09-30	26399
2017-12-31	26946
2018-03-31	28167
2018-06-30	26964
2018-09-30	26116
2018-12-31	26404
2019-03-31	28140
2019-06-30	27655
2019-09-30	26670
2019-12-31	29255
2020-03-31	26736
2020-06-30	27143
2020-09-30	27942
2020-12-31	29278
2021-03-31	28358
2021-06-30	28040
2021-09-30	28637
2021-12-31	27453
2022-03-31	27906
2022-06-30	27271
2022-09-30	26329
2022-12-31	27105
2023-03-31	28223
2023-06-30	25256
2023-09-30	25399