Quarter	US dollars
2004-12-31	6449
2005-03-31	7089
2005-06-30	6371
2005-09-30	6578
2005-12-31	6667
2006-03-31	7261
2006-06-30	11233
2006-09-30	15381
2006-12-31	13654
2007-03-31	13205
2007-06-30	16158
2007-09-30	15613
2007-12-31	16865
2008-03-31	19408
2008-06-30	17702
2008-09-30	17151
2008-12-31	10714
2009-03-31	11310
2009-06-30	12550
2009-09-30	10439
2009-12-31	10461
2010-03-31	8495
2010-06-30	8386
2010-09-30	9325
2010-12-31	8726
2011-03-31	8355
2011-06-30	8246
2011-09-30	7467
2011-12-31	8202
2012-03-31	9223
2012-06-30	7441
2012-09-30	8065
2012-12-31	8855
2013-03-31	8606
2013-06-30	7485
2013-09-30	7857
2013-12-31	8462
2014-03-31	9422
2014-06-30	8923
2014-09-30	10368
2014-12-31	14857
2015-03-31	9661
2015-06-30	9618
2015-09-30	9903
2015-12-31	10158
2016-03-31	9968
2016-06-30	9759
2016-09-30	9012
2016-12-31	9161
2017-03-31	10233
2017-06-30	9958
2017-09-30	10214
2017-12-31	9073
2018-03-31	8893
2018-06-30	9189
2018-09-30	9443
2018-12-31	10049
2019-03-31	11444
2019-06-30	11184
2019-09-30	11015
2019-12-31	12456
2020-03-31	11392
2020-06-30	10775
2020-09-30	13074
2020-12-31	13062
2021-03-31	13646
2021-06-30	14300
2021-09-30	13349
2021-12-31	13350
2022-03-31	13079
2022-06-30	11942
2022-09-30	12220
2022-12-31	12150
2023-03-31	12439
2023-06-30	11913
2023-09-30	11872