Quarter	US dollars
2004-12-31	26648
2005-03-31	22762
2005-06-30	22042
2005-09-30	20161
2005-12-31	20063
2006-03-31	25015
2006-06-30	25026
2006-09-30	25269
2006-12-31	28353
2007-03-31	27227
2007-06-30	29831
2007-09-30	33648
2007-12-31	41568
2008-03-31	39994
2008-06-30	41022
2008-09-30	38349
2008-12-31	39318
2009-03-31	39400
2009-06-30	39268
2009-09-30	34225
2009-12-31	30723
2010-03-31	24486
2010-06-30	28636
2010-09-30	29230
2010-12-31	30748
2011-03-31	35976
2011-06-30	31619
2011-09-30	23217
2011-12-31	21393
2012-03-31	22698
2012-06-30	24067
2012-09-30	24338
2012-12-31	25956
2013-03-31	32709
2013-06-30	38210
2013-09-30	46331
2013-12-31	49430
2014-03-31	39138
2014-06-30	36892
2014-09-30	37414
2014-12-31	40389
2015-03-31	31874
2015-06-30	29426
2015-09-30	27877
2015-12-31	25317
2016-03-31	27130
2016-06-30	25725
2016-09-30	23498
2016-12-31	28087
2017-03-31	24120
2017-06-30	20744
2017-09-30	22281
2017-12-31	24691
2018-03-31	22644
2018-06-30	23854
2018-09-30	22597
2018-12-31	23068
2019-03-31	24029
2019-06-30	21933
2019-09-30	23090
2019-12-31	24696
2020-03-31	27128
2020-06-30	24085
2020-09-30	21892
2020-12-31	21170
2021-03-31	24779
2021-06-30	27922
2021-09-30	29665
2021-12-31	29180
2022-03-31	29505
2022-06-30	20033
2022-09-30	19335
2022-12-31	20716
2023-03-31	23751
2023-06-30	24713
2023-09-30	23970