Quarter	US dollars
2004-12-31	7835
2005-03-31	8581
2005-06-30	9022
2005-09-30	9974
2005-12-31	10152
2006-03-31	11056
2006-06-30	11194
2006-09-30	12474
2006-12-31	13820
2007-03-31	15186
2007-06-30	16557
2007-09-30	17974
2007-12-31	16986
2008-03-31	17564
2008-06-30	19328
2008-09-30	20703
2008-12-31	17602
2009-03-31	16425
2009-06-30	16927
2009-09-30	18189
2009-12-31	19103
2010-03-31	20256
2010-06-30	20217
2010-09-30	20614
2010-12-31	21009
2011-03-31	21889
2011-06-30	22091
2011-09-30	20128
2011-12-31	21016
2012-03-31	21907
2012-06-30	20975
2012-09-30	19933
2012-12-31	19319
2013-03-31	21114
2013-06-30	19766
2013-09-30	19557
2013-12-31	19516
2014-03-31	21158
2014-06-30	21865
2014-09-30	22202
2014-12-31	21498
2015-03-31	21265
2015-06-30	16435
2015-09-30	15906
2015-12-31	15013
2016-03-31	14234
2016-06-30	11879
2016-09-30	12256
2016-12-31	12312
2017-03-31	15206
2017-06-30	11672
2017-09-30	11921
2017-12-31	13688
2018-03-31	9732
2018-06-30	9279
2018-09-30	11078
2018-12-31	11312
2019-03-31	12132
2019-06-30	12794
2019-09-30	12442
2019-12-31	13834
2020-03-31	13094
2020-06-30	12292
2020-09-30	10412
2020-12-31	9655
2021-03-31	10001
2021-06-30	9566
2021-09-30	10384
2021-12-31	9319
2022-03-31	8267
2022-06-30	7765
2022-09-30	6938
2022-12-31	7112
2023-03-31	7055
2023-06-30	7702
2023-09-30	6563