Quarter	US dollars
2004-12-31	12556
2005-03-31	12804
2005-06-30	13406
2005-09-30	13606
2005-12-31	13927
2006-03-31	14981
2006-06-30	15343
2006-09-30	15484
2006-12-31	15539
2007-03-31	16453
2007-06-30	16675
2007-09-30	18286
2007-12-31	17375
2008-03-31	18633
2008-06-30	16643
2008-09-30	17555
2008-12-31	16982
2009-03-31	16492
2009-06-30	16015
2009-09-30	16545
2009-12-31	16342
2010-03-31	17436
2010-06-30	18861
2010-09-30	21233
2010-12-31	22512
2011-03-31	23362
2011-06-30	24900
2011-09-30	23758
2011-12-31	24475
2012-03-31	25359
2012-06-30	24928
2012-09-30	26000
2012-12-31	27089
2013-03-31	27686
2013-06-30	28059
2013-09-30	27177
2013-12-31	27273
2014-03-31	26653
2014-06-30	27140
2014-09-30	27500
2014-12-31	26303
2015-03-31	24858
2015-06-30	24441
2015-09-30	21969
2015-12-31	21805
2016-03-31	23550
2016-06-30	22218
2016-09-30	21869
2016-12-31	20881
2017-03-31	21179
2017-06-30	22360
2017-09-30	23135
2017-12-31	23763
2018-03-31	25787
2018-06-30	24606
2018-09-30	23230
2018-12-31	23409
2019-03-31	23805
2019-06-30	23574
2019-09-30	23215
2019-12-31	22498
2020-03-31	21468
2020-06-30	21696
2020-09-30	21477
2020-12-31	22223
2021-03-31	21384
2021-06-30	21512
2021-09-30	20728
2021-12-31	21331
2022-03-31	21242
2022-06-30	20332
2022-09-30	19686
2022-12-31	20119
2023-03-31	19373
2023-06-30	18079
2023-09-30	18221