Quarter	US dollars
2004-12-31	8657
2005-03-31	8456
2005-06-30	6338
2005-09-30	8628
2005-12-31	7829
2006-03-31	9389
2006-06-30	8391
2006-09-30	9111
2006-12-31	8859
2007-03-31	12960
2007-06-30	9649
2007-09-30	16990
2007-12-31	12348
2008-03-31	16278
2008-06-30	15722
2008-09-30	13057
2008-12-31	7486
2009-03-31	8417
2009-06-30	6920
2009-09-30	10384
2009-12-31	14010
2010-03-31	18490
2010-06-30	20043
2010-09-30	19821
2010-12-31	24439
2011-03-31	25566
2011-06-30	27266
2011-09-30	25456
2011-12-31	27055
2012-03-31	29146
2012-06-30	30832
2012-09-30	30638
2012-12-31	33054
2013-03-31	31429
2013-06-30	36348
2013-09-30	37740
2013-12-31	35327
2014-03-31	31519
2014-06-30	32442
2014-09-30	31185
2014-12-31	27520
2015-03-31	28625
2015-06-30	30912
2015-09-30	25821
2015-12-31	24973
2016-03-31	27816
2016-06-30	29150
2016-09-30	26487
2016-12-31	25016
2017-03-31	26981
2017-06-30	31173
2017-09-30	31120
2017-12-31	28037
2018-03-31	31371
2018-06-30	32345
2018-09-30	31804
2018-12-31	30358
2019-03-31	31091
2019-06-30	28390
2019-09-30	26895
2019-12-31	23301
2020-03-31	29987
2020-06-30	26127
2020-09-30	26711
2020-12-31	23983
2021-03-31	27486
2021-06-30	25204
2021-09-30	24289
2021-12-31	24159
2022-03-31	26504
2022-06-30	24514
2022-09-30	29497
2022-12-31	31785
2023-03-31	29999
2023-06-30	32647
2023-09-30	32712