Quarter	US dollars
2004-12-31	2500
2005-03-31	2076
2005-06-30	1947
2005-09-30	2264
2005-12-31	2178
2006-03-31	2858
2006-06-30	3667
2006-09-30	2913
2006-12-31	1871
2007-03-31	2348
2007-06-30	2462
2007-09-30	2966
2007-12-31	4081
2008-03-31	7851
2008-06-30	5477
2008-09-30	5842
2008-12-31	7153
2009-03-31	4983
2009-06-30	4028
2009-09-30	4275
2009-12-31	3879
2010-03-31	3390
2010-06-30	5427
2010-09-30	7113
2010-12-31	5172
2011-03-31	4862
2011-06-30	6906
2011-09-30	8606
2011-12-31	6152
2012-03-31	4615
2012-06-30	5250
2012-09-30	5642
2012-12-31	4082
2013-03-31	4714
2013-06-30	4638
2013-09-30	7901
2013-12-31	4431
2014-03-31	4592
2014-06-30	4172
2014-09-30	4424
2014-12-31	4430
2015-03-31	4269
2015-06-30	3920
2015-09-30	5736
2015-12-31	5167
2016-03-31	3803
2016-06-30	3885
2016-09-30	2962
2016-12-31	3658
2017-03-31	2765
2017-06-30	2155
2017-09-30	1822
2017-12-31	2853
2018-03-31	3187
2018-06-30	1297
2018-09-30	2835
2018-12-31	2072
2019-03-31	1801
2019-06-30	3501
2019-09-30	3031
2019-12-31	2359
2020-03-31	5987
2020-06-30	3807
2020-09-30	3691
2020-12-31	4249
2021-03-31	4320
2021-06-30	4121
2021-09-30	3384
2021-12-31	2894
2022-03-31	2594
2022-06-30	3437
2022-09-30	5158
2022-12-31	3722
2023-03-31	3103
2023-06-30	3270
2023-09-30	3529