Quarter	US dollars
2004-12-31	3085
2005-03-31	3000
2005-06-30	2515
2005-09-30	3939
2005-12-31	2815
2006-03-31	3119
2006-06-30	2974
2006-09-30	2703
2006-12-31	3256
2007-03-31	4615
2007-06-30	3848
2007-09-30	5322
2007-12-31	9124
2008-03-31	11295
2008-06-30	8161
2008-09-30	9001
2008-12-31	6632
2009-03-31	6561
2009-06-30	7806
2009-09-30	6818
2009-12-31	6876
2010-03-31	9548
2010-06-30	9371
2010-09-30	11586
2010-12-31	14306
2011-03-31	13834
2011-06-30	11853
2011-09-30	13850
2011-12-31	11209
2012-03-31	9606
2012-06-30	9730
2012-09-30	9161
2012-12-31	9195
2013-03-31	8186
2013-06-30	7013
2013-09-30	9211
2013-12-31	9128
2014-03-31	11698
2014-06-30	10831
2014-09-30	12410
2014-12-31	11600
2015-03-31	12232
2015-06-30	12663
2015-09-30	11877
2015-12-31	10496
2016-03-31	14175
2016-06-30	14683
2016-09-30	17722
2016-12-31	14583
2017-03-31	14741
2017-06-30	20280
2017-09-30	19946
2017-12-31	21535
2018-03-31	22488
2018-06-30	21310
2018-09-30	19070
2018-12-31	18968
2019-03-31	19118
2019-06-30	17777
2019-09-30	16480
2019-12-31	17853
2020-03-31	18448
2020-06-30	17693
2020-09-30	15529
2020-12-31	18740
2021-03-31	16472
2021-06-30	18291
2021-09-30	17343
2021-12-31	17528
2022-03-31	18327
2022-06-30	21146
2022-09-30	19685
2022-12-31	20714
2023-03-31	18460
2023-06-30	20899
2023-09-30	21598