Quarter	US dollars
2004-12-31	20362
2005-03-31	20106
2005-06-30	20789
2005-09-30	28181
2005-12-31	26978
2006-03-31	32326
2006-06-30	32311
2006-09-30	40121
2006-12-31	34488
2007-03-31	37606
2007-06-30	42792
2007-09-30	45359
2007-12-31	52735
2008-03-31	63008
2008-06-30	67912
2008-09-30	58219
2008-12-31	56005
2009-03-31	58764
2009-06-30	47866
2009-09-30	52527
2009-12-31	53628
2010-03-31	39219
2010-06-30	45498
2010-09-30	64027
2010-12-31	55622
2011-03-31	73164
2011-06-30	73968
2011-09-30	78149
2011-12-31	70375
2012-03-31	74307
2012-06-30	80402
2012-09-30	73704
2012-12-31	73045
2013-03-31	64588
2013-06-30	58672
2013-09-30	63950
2013-12-31	55865
2014-03-31	42905
2014-06-30	33322
2014-09-30	30644
2014-12-31	23162
2015-03-31	24143
2015-06-30	23861
2015-09-30	24805
2015-12-31	23986
2016-03-31	26512
2016-06-30	25429
2016-09-30	27668
2016-12-31	29423
2017-03-31	35026
2017-06-30	36615
2017-09-30	35336
2017-12-31	33485
2018-03-31	35467
2018-06-30	33293
2018-09-30	31335
2018-12-31	29153
2019-03-31	30042
2019-06-30	35884
2019-09-30	35910
2019-12-31	31917
2020-03-31	28740
2020-06-30	32856
2020-09-30	27785
2020-12-31	32904
2021-03-31	30409
2021-06-30	29787
2021-09-30	26154
2021-12-31	26287
2022-03-31	19652
2022-06-30	16052
2022-09-30	11148
2022-12-31	15067
2023-03-31	18908
2023-06-30	23893
2023-09-30	25213