Quarter	US dollars
2004-12-31	2041
2005-03-31	2282
2005-06-30	1991
2005-09-30	1919
2005-12-31	2069
2006-03-31	2581
2006-06-30	3016
2006-09-30	2894
2006-12-31	3227
2007-03-31	3120
2007-06-30	3146
2007-09-30	2928
2007-12-31	2883
2008-03-31	3188
2008-06-30	3407
2008-09-30	3151
2008-12-31	2522
2009-03-31	2605
2009-06-30	3005
2009-09-30	2607
2009-12-31	2589
2010-03-31	1875
2010-06-30	1851
2010-09-30	2412
2010-12-31	1880
2011-03-31	1706
2011-06-30	1962
2011-09-30	2007
2011-12-31	2131
2012-03-31	2178
2012-06-30	2350
2012-09-30	2290
2012-12-31	3104
2013-03-31	2898
2013-06-30	2600
2013-09-30	2751
2013-12-31	3345
2014-03-31	3376
2014-06-30	3548
2014-09-30	3735
2014-12-31	4400
2015-03-31	4402
2015-06-30	4341
2015-09-30	4627
2015-12-31	4340
2016-03-31	3277
2016-06-30	3133
2016-09-30	2620
2016-12-31	2398
2017-03-31	2700
2017-06-30	2720
2017-09-30	2886
2017-12-31	3372
2018-03-31	2762
2018-06-30	2753
2018-09-30	3065
2018-12-31	3062
2019-03-31	3136
2019-06-30	3574
2019-09-30	3504
2019-12-31	4048
2020-03-31	3763
2020-06-30	3839
2020-09-30	4156
2020-12-31	4458
2021-03-31	4929
2021-06-30	5076
2021-09-30	4899
2021-12-31	4918
2022-03-31	4723
2022-06-30	4421
2022-09-30	4450
2022-12-31	4025
2023-03-31	3936
2023-06-30	3674
2023-09-30	3542