Quarter	US dollars
2004-12-31	15288
2005-03-31	16184
2005-06-30	16579
2005-09-30	15512
2005-12-31	17154
2006-03-31	18779
2006-06-30	19888
2006-09-30	19896
2006-12-31	22329
2007-03-31	22486
2007-06-30	25475
2007-09-30	30414
2007-12-31	32448
2008-03-31	34575
2008-06-30	33897
2008-09-30	29872
2008-12-31	29922
2009-03-31	31303
2009-06-30	29097
2009-09-30	29736
2009-12-31	30630
2010-03-31	30856
2010-06-30	35146
2010-09-30	37116
2010-12-31	36274
2011-03-31	37970
2011-06-30	34516
2011-09-30	37862
2011-12-31	41236
2012-03-31	41953
2012-06-30	43257
2012-09-30	43859
2012-12-31	44189
2013-03-31	45027
2013-06-30	43528
2013-09-30	45955
2013-12-31	44536
2014-03-31	46318
2014-06-30	48422
2014-09-30	46538
2014-12-31	48068
2015-03-31	48728
2015-06-30	47502
2015-09-30	41725
2015-12-31	39413
2016-03-31	40406
2016-06-30	42199
2016-09-30	42484
2016-12-31	43412
2017-03-31	40585
2017-06-30	41147
2017-09-30	46591
2017-12-31	47354
2018-03-31	47672
2018-06-30	46848
2018-09-30	43176
2018-12-31	42051
2019-03-31	43632
2019-06-30	42500
2019-09-30	41364
2019-12-31	40322
2020-03-31	39979
2020-06-30	39286
2020-09-30	36881
2020-12-31	37067
2021-03-31	37579
2021-06-30	38616
2021-09-30	39167
2021-12-31	38337
2022-03-31	38927
2022-06-30	37645
2022-09-30	37794
2022-12-31	40021
2023-03-31	37273
2023-06-30	35928
2023-09-30	35532