Quarter	US dollars
2004-12-31	3448
2005-03-31	3796
2005-06-30	3418
2005-09-30	3179
2005-12-31	3864
2006-03-31	3630
2006-06-30	3610
2006-09-30	3570
2006-12-31	3818
2007-03-31	3791
2007-06-30	3628
2007-09-30	3822
2007-12-31	3432
2008-03-31	4066
2008-06-30	3690
2008-09-30	3259
2008-12-31	3058
2009-03-31	4458
2009-06-30	4270
2009-09-30	4001
2009-12-31	4848
2010-03-31	4767
2010-06-30	5084
2010-09-30	4964
2010-12-31	6267
2011-03-31	5080
2011-06-30	5131
2011-09-30	4719
2011-12-31	4963
2012-03-31	5253
2012-06-30	5429
2012-09-30	5366
2012-12-31	4816
2013-03-31	5064
2013-06-30	4788
2013-09-30	5440
2013-12-31	3952
2014-03-31	3261
2014-06-30	3349
2014-09-30	3059
2014-12-31	2731
2015-03-31	3047
2015-06-30	3044
2015-09-30	3366
2015-12-31	3010
2016-03-31	3262
2016-06-30	3281
2016-09-30	3159
2016-12-31	3907
2017-03-31	3171
2017-06-30	3687
2017-09-30	4180
2017-12-31	4358
2018-03-31	3647
2018-06-30	3249
2018-09-30	3606
2018-12-31	2883
2019-03-31	2966
2019-06-30	2639
2019-09-30	3049
2019-12-31	3337
2020-03-31	3315
2020-06-30	3013
2020-09-30	2810
2020-12-31	2850
2021-03-31	2794
2021-06-30	3323
2021-09-30	3328
2021-12-31	3995
2022-03-31	3824
2022-06-30	4018
2022-09-30	4999
2022-12-31	3871
2023-03-31	4213
2023-06-30	4455
2023-09-30	4378