Quarter	US dollars
2004-12-31	2997
2005-03-31	3486
2005-06-30	3773
2005-09-30	3467
2005-12-31	2946
2006-03-31	2961
2006-06-30	2817
2006-09-30	2761
2006-12-31	3746
2007-03-31	3368
2007-06-30	3543
2007-09-30	3396
2007-12-31	3886
2008-03-31	3975
2008-06-30	4287
2008-09-30	3994
2008-12-31	3584
2009-03-31	3255
2009-06-30	3391
2009-09-30	3392
2009-12-31	2983
2010-03-31	3185
2010-06-30	3350
2010-09-30	3493
2010-12-31	3383
2011-03-31	3599
2011-06-30	3916
2011-09-30	3792
2011-12-31	4046
2012-03-31	4524
2012-06-30	4910
2012-09-30	5604
2012-12-31	4931
2013-03-31	5070
2013-06-30	4987
2013-09-30	4769
2013-12-31	5352
2014-03-31	5454
2014-06-30	5890
2014-09-30	5744
2014-12-31	5987
2015-03-31	6041
2015-06-30	5694
2015-09-30	3996
2015-12-31	3894
2016-03-31	3803
2016-06-30	3596
2016-09-30	3804
2016-12-31	4424
2017-03-31	3548
2017-06-30	2198
2017-09-30	3279
2017-12-31	3653
2018-03-31	3983
2018-06-30	3726
2018-09-30	3721
2018-12-31	3971
2019-03-31	4958
2019-06-30	4347
2019-09-30	4101
2019-12-31	4384
2020-03-31	4835
2020-06-30	4570
2020-09-30	4441
2020-12-31	2334
2021-03-31	2561
2021-06-30	1646
2021-09-30	1425
2021-12-31	1597
2022-03-31	1407
2022-06-30	1313
2022-09-30	929
2022-12-31	875
2023-03-31	1487
2023-06-30	1230
2023-09-30	1358