Quarter	US dollars
2004-12-31	4387
2005-03-31	4686
2005-06-30	4365
2005-09-30	4390
2005-12-31	4325
2006-03-31	4510
2006-06-30	4779
2006-09-30	4857
2006-12-31	4560
2007-03-31	4897
2007-06-30	4962
2007-09-30	5144
2007-12-31	5465
2008-03-31	5770
2008-06-30	6006
2008-09-30	5416
2008-12-31	5322
2009-03-31	5142
2009-06-30	5624
2009-09-30	5897
2009-12-31	5892
2010-03-31	6062
2010-06-30	5683
2010-09-30	6185
2010-12-31	6218
2011-03-31	6287
2011-06-30	6898
2011-09-30	6180
2011-12-31	6147
2012-03-31	6637
2012-06-30	6587
2012-09-30	6553
2012-12-31	6776
2013-03-31	6786
2013-06-30	6960
2013-09-30	6975
2013-12-31	6998
2014-03-31	6888
2014-06-30	7376
2014-09-30	6431
2014-12-31	6150
2015-03-31	5158
2015-06-30	5115
2015-09-30	5108
2015-12-31	5053
2016-03-31	5193
2016-06-30	5088
2016-09-30	5096
2016-12-31	4732
2017-03-31	4980
2017-06-30	5578
2017-09-30	5044
2017-12-31	4911
2018-03-31	5195
2018-06-30	5359
2018-09-30	4973
2018-12-31	4861
2019-03-31	5110
2019-06-30	5168
2019-09-30	5027
2019-12-31	5376
2020-03-31	5413
2020-06-30	5552
2020-09-30	6078
2020-12-31	6352
2021-03-31	6094
2021-06-30	6051
2021-09-30	6068
2021-12-31	6720
2022-03-31	6742
2022-06-30	6355
2022-09-30	5867
2022-12-31	6293
2023-03-31	6193
2023-06-30	6341
2023-09-30	5988