Quarter	US dollars
2004-12-31	9390
2005-03-31	12985
2005-06-30	9975
2005-09-30	10402
2005-12-31	9496
2006-03-31	13428
2006-06-30	12152
2006-09-30	13586
2006-12-31	14689
2007-03-31	15078
2007-06-30	14069
2007-09-30	16485
2007-12-31	18521
2008-03-31	17679
2008-06-30	18197
2008-09-30	19261
2008-12-31	12798
2009-12-31	11502
2010-03-31	13832
2010-06-30	10280
2010-09-30	15508
2010-12-31	12526
2011-03-31	13206
2011-06-30	10502
2011-09-30	15174
2011-12-31	10054
2012-03-31	14734
2012-06-30	17782
2012-09-30	19098
2012-12-31	12613
2013-03-31	11293
2013-06-30	12957
2013-09-30	11796
2013-12-31	8808
2014-03-31	7074
2014-06-30	7788
2014-09-30	7042
2014-12-31	5444
2015-03-31	8147
2015-06-30	7547
2015-09-30	7372
2015-12-31	8474
2016-03-31	10113
2016-06-30	10377
2016-09-30	9203
2016-12-31	6475
2017-03-31	6018
2017-06-30	6666
2017-09-30	4288
2017-12-31	6080
2018-03-31	7390
2018-06-30	10763
2018-09-30	6694
2018-12-31	4477
2019-03-31	6542
2019-06-30	6173
2019-09-30	5082
2019-12-31	4902
2020-03-31	5529
2020-06-30	6374
2020-09-30	5994
2020-12-31	6027
2021-03-31	6868
2021-06-30	6585
2021-09-30	7446
2021-12-31	6955
2022-03-31	10719
2022-06-30	7830
2022-09-30	8019
2022-12-31	8229
2023-03-31	9571
2023-06-30	9018
2023-09-30	8764