Quarter	US dollars
2004-12-31	22165
2005-03-31	22292
2005-06-30	19642
2005-09-30	23896
2005-12-31	22055
2006-03-31	24146
2006-06-30	29966
2006-09-30	28886
2006-12-31	31735
2007-03-31	39267
2007-06-30	47215
2007-09-30	30532
2007-12-31	31785
2008-03-31	31971
2008-06-30	35159
2008-09-30	32962
2008-12-31	29924
2009-03-31	28778
2009-06-30	28835
2009-09-30	26580
2009-12-31	27376
2010-03-31	26664
2010-06-30	27181
2010-09-30	29824
2010-12-31	28207
2011-03-31	30234
2011-06-30	30561
2011-09-30	31155
2011-12-31	30410
2012-03-31	30049
2012-06-30	30955
2012-09-30	39655
2012-12-31	38949
2013-03-31	37125
2013-06-30	37499
2013-09-30	42621
2013-12-31	39945
2014-03-31	39862
2014-06-30	40294
2014-09-30	38170
2014-12-31	36234
2015-03-31	33113
2015-06-30	32122
2015-09-30	31815
2015-12-31	32695
2016-03-31	33537
2016-06-30	27585
2016-09-30	39568
2016-12-31	34148
2017-03-31	34284
2017-06-30	32797
2017-09-30	32524
2017-12-31	37429
2018-03-31	34763
2018-06-30	28987
2018-09-30	31915
2018-12-31	44329
2019-03-31	53975
2019-06-30	52638
2019-09-30	53922
2019-12-31	46755
2020-03-31	54791
2020-06-30	55827
2020-09-30	62941
2020-12-31	57509
2021-03-31	50783
2021-06-30	43233
2021-09-30	49420
2021-12-31	54926
2022-03-31	47400
2022-06-30	33571
2022-09-30	41465
2022-12-31	49044
2023-03-31	44630
2023-06-30	51066
2023-09-30	47281