Quarter	US dollars
2004-12-31	14420
2005-03-31	14327
2005-06-30	14003
2005-09-30	17085
2005-12-31	16117
2006-03-31	19707
2006-06-30	21423
2006-09-30	23784
2006-12-31	25312
2007-03-31	28523
2007-06-30	31161
2007-09-30	38505
2007-12-31	52743
2008-03-31	49179
2008-06-30	60127
2008-09-30	54887
2008-12-31	31304
2009-03-31	34829
2009-06-30	42102
2009-09-30	44345
2009-12-31	39283
2010-03-31	37955
2010-06-30	38122
2010-09-30	42228
2010-12-31	38467
2011-03-31	48133
2011-06-30	48597
2011-09-30	29055
2011-12-31	25341
2012-03-31	32807
2012-06-30	30591
2012-09-30	33934
2012-12-31	29783
2013-03-31	30459
2013-06-30	29852
2013-09-30	30029
2013-12-31	35375
2014-03-31	20008
2014-06-30	23202
2014-09-30	20811
2014-12-31	18761
2015-03-31	19004
2015-06-30	18365
2015-09-30	17902
2015-12-31	18980
2016-03-31	21462
2016-06-30	22911
2016-09-30	23269
2016-12-31	22213
2017-03-31	23374
2017-06-30	27819
2017-09-30	27314
2017-12-31	27473
2018-03-31	28685
2018-06-30	25383
2018-09-30	24072
2018-12-31	24712
2019-03-31	27067
2019-06-30	25049
2019-09-30	23130
2019-12-31	25384
2020-03-31	24732
2020-06-30	23621
2020-09-30	26130
2020-12-31	27294
2021-03-31	24573
2021-06-30	27539
2021-09-30	27115
2021-12-31	25852
2022-03-31	26766
2022-06-30	29546
2022-09-30	27142
2022-12-31	28604
2023-03-31	26533
2023-06-30	29109
2023-09-30	28528