Quarter	US dollars
2004-12-31	6674
2005-03-31	7253
2005-06-30	7408
2005-09-30	9180
2005-12-31	13832
2006-03-31	9646
2006-06-30	10101
2006-09-30	9481
2006-12-31	11182
2007-03-31	12684
2007-06-30	14627
2007-09-30	16381
2007-12-31	19176
2008-03-31	19265
2008-06-30	21093
2008-09-30	21082
2008-12-31	20368
2009-03-31	20035
2009-06-30	17150
2009-09-30	15563
2009-12-31	14653
2010-03-31	7872
2010-06-30	5768
2010-09-30	5757
2010-12-31	5446
2011-03-31	5256
2011-06-30	5573
2011-09-30	5627
2011-12-31	5869
2012-03-31	4523
2012-06-30	4533
2012-09-30	5452
2012-12-31	6393
2013-03-31	5262
2013-06-30	4441
2013-09-30	4701
2013-12-31	5091
2014-03-31	6671
2014-06-30	5743
2014-09-30	5522
2014-12-31	5817
2015-03-31	5640
2015-06-30	5478
2015-09-30	4945
2015-12-31	4066
2016-03-31	3655
2016-06-30	4317
2016-09-30	4613
2016-12-31	5349
2017-03-31	5976
2017-06-30	7247
2017-09-30	7610
2017-12-31	9643
2018-03-31	9542
2018-06-30	9368
2018-09-30	9396
2018-12-31	10809
2019-03-31	8730
2019-06-30	9345
2019-09-30	9037
2019-12-31	10029
2020-03-31	10117
2020-06-30	7669
2020-09-30	7814
2020-12-31	8393
2021-03-31	8505
2021-06-30	8551
2021-09-30	8976
2021-12-31	8430
2022-03-31	10688
2022-06-30	9609
2022-09-30	8544
2022-12-31	8733
2023-03-31	8487
2023-06-30	9498
2023-09-30	10307