Quarter	US dollars
2004-12-31	26364
2005-03-31	28267
2005-06-30	26864
2005-09-30	28541
2005-12-31	29692
2006-03-31	20915
2006-06-30	22296
2006-09-30	21613
2006-12-31	22490
2007-03-31	26085
2007-06-30	28908
2007-09-30	32325
2007-12-31	35705
2008-03-31	34018
2008-06-30	35957
2008-09-30	37454
2008-12-31	31941
2009-03-31	25959
2009-06-30	25739
2009-09-30	24279
2009-12-31	24146
2010-03-31	24965
2010-06-30	33234
2010-09-30	32761
2010-12-31	33496
2011-03-31	33225
2011-06-30	35335
2011-09-30	33048
2011-12-31	31305
2012-03-31	29084
2012-06-30	31132
2012-09-30	31497
2012-12-31	33946
2013-03-31	45652
2013-06-30	44013
2013-09-30	43308
2013-12-31	42535
2014-03-31	35955
2014-06-30	33007
2014-09-30	33048
2014-12-31	30091
2015-03-31	29725
2015-06-30	31568
2015-09-30	29491
2015-12-31	29724
2016-03-31	28204
2016-06-30	27473
2016-09-30	25161
2016-12-31	25233
2017-03-31	24550
2017-06-30	23313
2017-09-30	23047
2017-12-31	22512
2018-03-31	22430
2018-06-30	22774
2018-09-30	21222
2018-12-31	22007
2019-03-31	23623
2019-06-30	25465
2019-09-30	25516
2019-12-31	26568
2020-03-31	28269
2020-06-30	27834
2020-09-30	29940
2020-12-31	28277
2021-03-31	29288
2021-06-30	26832
2021-09-30	29192
2021-12-31	30184
2022-03-31	32463
2022-06-30	32236
2022-09-30	33345
2022-12-31	30751
2023-03-31	31929
2023-06-30	33992
2023-09-30	35218