Quarter	US dollars
2004-12-31	52734
2005-03-31	52597
2005-06-30	58545
2005-09-30	50522
2005-12-31	46250
2006-03-31	50634
2006-06-30	59020
2006-09-30	52937
2006-12-31	51109
2007-03-31	63697
2007-06-30	58557
2007-09-30	60751
2007-12-31	58867
2008-03-31	60899
2008-06-30	52961
2008-09-30	49911
2008-12-31	38602
2009-03-31	44174
2009-06-30	42450
2009-09-30	41890
2009-12-31	43934
2010-03-31	32371
2010-06-30	31920
2010-09-30	27524
2010-12-31	25192
2011-03-31	25848
2011-06-30	29012
2011-09-30	18816
2011-12-31	17078
2012-03-31	13653
2012-06-30	12819
2012-09-30	12004
2012-12-31	15491
2013-03-31	13604
2013-06-30	13385
2013-09-30	14076
2013-12-31	14645
2014-03-31	15573
2014-06-30	17253
2014-09-30	15536
2014-12-31	12625
2015-03-31	15628
2015-06-30	9879
2015-09-30	13182
2015-12-31	12442
2016-03-31	15090
2016-06-30	9106
2016-09-30	7888
2016-12-31	6815
2017-03-31	11571
2017-06-30	12556
2017-09-30	12878
2017-12-31	9503
2018-03-31	17092
2018-06-30	14398
2018-09-30	17099
2018-12-31	17128
2019-03-31	19628
2019-06-30	21671
2019-09-30	22068
2019-12-31	20009
2020-03-31	17636
2020-06-30	15391
2020-09-30	16147
2020-12-31	13629
2021-03-31	11556
2021-06-30	12854
2021-09-30	10276
2021-12-31	9885
2022-03-31	10563
2022-06-30	12367
2022-09-30	10672
2022-12-31	8305
2023-03-31	7634
2023-06-30	16510
2023-09-30	20820