Quarter	US dollars
2004-12-31	6647
2005-03-31	7235
2005-06-30	7398
2005-09-30	9095
2005-12-31	13144
2006-03-31	9521
2006-06-30	10042
2006-09-30	9388
2006-12-31	11071
2007-03-31	12517
2007-06-30	14761
2007-09-30	16368
2007-12-31	19141
2008-03-31	19201
2008-06-30	21246
2008-09-30	20770
2008-12-31	19741
2009-03-31	19268
2009-06-30	17212
2009-09-30	15592
2009-12-31	14569
2010-03-31	7796
2010-06-30	5702
2010-09-30	5459
2010-12-31	5385
2011-03-31	5202
2011-06-30	5538
2011-09-30	5546
2011-12-31	6130
2012-03-31	4141
2012-06-30	4293
2012-09-30	5195
2012-12-31	5993
2013-03-31	5114
2013-06-30	4210
2013-09-30	4427
2013-12-31	5053
2014-03-31	6624
2014-06-30	5606
2014-09-30	5428
2014-12-31	5691
2015-03-31	5577
2015-06-30	5264
2015-09-30	4793
2015-12-31	3948
2016-03-31	3524
2016-06-30	4207
2016-09-30	4520
2016-12-31	5268
2017-03-31	5638
2017-06-30	7281
2017-09-30	7787
2017-12-31	9745
2018-03-31	8866
2018-06-30	8681
2018-09-30	8620
2018-12-31	10551
2019-03-31	8726
2019-06-30	9024
2019-09-30	8294
2019-12-31	9269
2020-03-31	9378
2020-06-30	7041
2020-09-30	7084
2020-12-31	7825
2021-03-31	7963
2021-06-30	8385
2021-09-30	8738
2021-12-31	8197
2022-03-31	10464
2022-06-30	9504
2022-09-30	8274
2022-12-31	8582
2023-03-31	8394
2023-06-30	9453
2023-09-30	10009