Quarter	US dollars
2004-12-31	8294
2005-03-31	12460
2005-06-30	5693
2005-09-30	5996
2005-12-31	9005
2006-03-31	8893
2006-06-30	8137
2006-09-30	11798
2006-12-31	8728
2007-03-31	10785
2007-06-30	9659
2007-09-30	11475
2007-12-31	7376
2008-03-31	13577
2008-06-30	10183
2008-09-30	12156
2008-12-31	5620
2009-03-31	10569
2009-06-30	16246
2009-09-30	19044
2009-12-31	18714
2010-03-31	13069
2010-06-30	14280
2010-09-30	13920
2010-12-31	15426
2011-03-31	6375
2011-06-30	17490
2011-09-30	14577
2011-12-31	9445
2012-03-31	13184
2012-06-30	18702
2012-09-30	17614
2012-12-31	17730
2013-03-31	17196
2013-06-30	13444
2013-09-30	17470
2013-12-31	20430
2014-03-31	11744
2014-06-30	20356
2014-09-30	17068
2014-12-31	19039
2015-03-31	16832
2015-06-30	15872
2015-09-30	12840
2015-12-31	12537
2016-03-31	14694
2016-06-30	15818
2016-09-30	13188
2016-12-31	18581
2017-03-31	18748
2017-06-30	14694
2017-09-30	20669
2017-12-31	18386
2018-03-31	25011
2018-06-30	24682
2018-09-30	21079
2018-12-31	23754
2019-03-31	23848
2019-06-30	17897
2019-09-30	19849
2019-12-31	23297
2020-03-31	20603
2020-06-30	21025
2020-09-30	19673
2020-12-31	17493
2021-03-31	22428
2021-06-30	28344
2021-09-30	29580
2021-12-31	34397
2022-03-31	33000
2022-06-30	18543
2022-09-30	18805
2022-12-31	15565
2023-03-31	10290
2023-06-30	15619
2023-09-30	12262