Quarter	US dollars
2004-12-31	5220
2005-03-31	6514
2005-06-30	5793
2005-09-30	4417
2005-12-31	3365
2006-03-31	4829
2006-06-30	6695
2006-09-30	6797
2006-12-31	8431
2007-03-31	9557
2007-06-30	9936
2007-09-30	11193
2007-12-31	11404
2008-03-31	12394
2008-06-30	12840
2008-09-30	12640
2008-12-31	9846
2009-03-31	15528
2009-06-30	17535
2009-09-30	17285
2009-12-31	16618
2010-03-31	10593
2010-06-30	10140
2010-09-30	10567
2010-12-31	10594
2011-03-31	11354
2011-06-30	10467
2011-09-30	8528
2011-12-31	8453
2012-03-31	8334
2012-06-30	8779
2012-09-30	9777
2012-12-31	9720
2013-03-31	8975
2013-06-30	8383
2013-09-30	8612
2013-12-31	10130
2014-03-31	10617
2014-06-30	10510
2014-09-30	9015
2014-12-31	9830
2015-03-31	9205
2015-06-30	10639
2015-09-30	10697
2015-12-31	10185
2016-03-31	9882
2016-06-30	10557
2016-09-30	8703
2016-12-31	6967
2017-03-31	6128
2017-06-30	5973
2017-09-30	6361
2017-12-31	6401
2018-03-31	6194
2018-06-30	5735
2018-09-30	5417
2018-12-31	5091
2019-03-31	5119
2019-06-30	4849
2019-09-30	4914
2019-12-31	5213
2020-03-31	5281
2020-06-30	5127
2020-09-30	6546
2020-12-31	5035
2021-03-31	5288
2021-06-30	5298
2021-09-30	5073
2021-12-31	4880
2022-03-31	4684
2022-06-30	4256
2022-09-30	3798
2022-12-31	4189
2023-03-31	4398
2023-06-30	4728
2023-09-30	4338