Quarter	US dollars
2004-12-31	4518
2005-03-31	4320
2005-06-30	5897
2005-09-30	4212
2005-12-31	4657
2006-03-31	7588
2006-06-30	10135
2006-09-30	10630
2006-12-31	10022
2007-03-31	10281
2007-06-30	12388
2007-09-30	14417
2007-12-31	15169
2008-03-31	18134
2008-06-30	13561
2008-09-30	13708
2008-12-31	8930
2009-03-31	10125
2009-06-30	10976
2009-09-30	10327
2009-12-31	10281
2010-03-31	11002
2010-06-30	8398
2010-09-30	9351
2010-12-31	9720
2011-03-31	7686
2011-06-30	6271
2011-09-30	4934
2011-12-31	6687
2012-03-31	6992
2012-06-30	6776
2012-09-30	5247
2012-12-31	8584
2013-03-31	9351
2013-06-30	12322
2013-09-30	8476
2013-12-31	8570
2014-03-31	7091
2014-06-30	5080
2014-09-30	5040
2014-12-31	4988
2015-03-31	3560
2015-06-30	4009
2015-09-30	4059
2015-12-31	3691
2016-03-31	3162
2016-06-30	2682
2016-09-30	2731
2016-12-31	2821
2017-03-31	3089
2017-06-30	3849
2017-09-30	3461
2017-12-31	3833
2018-03-31	3142
2018-06-30	2227
2018-09-30	3052
2018-12-31	3772
2019-03-31	3776
2019-06-30	5287
2019-09-30	7677
2019-12-31	4119
2020-03-31	3577
2020-06-30	3828
2020-09-30	3961
2020-12-31	3288
2021-03-31	3991
2021-06-30	3256
2021-09-30	3204
2021-12-31	2997
2022-03-31	3520
2022-06-30	3231
2022-09-30	3785
2022-12-31	2605
2023-03-31	3437
2023-06-30	3525
2023-09-30	3095