Quarter	US dollars
2004-12-31	29997
2005-03-31	31570
2005-06-30	35610
2005-09-30	35392
2005-12-31	36764
2006-03-31	39057
2006-06-30	42812
2006-09-30	43565
2006-12-31	47669
2007-03-31	47294
2007-06-30	49831
2007-09-30	54914
2007-12-31	61015
2008-03-31	63662
2008-06-30	69009
2008-09-30	66387
2008-12-31	57677
2009-03-31	56243
2009-06-30	52821
2009-09-30	55648
2009-12-31	53524
2010-03-31	55708
2010-06-30	58391
2010-09-30	63759
2010-12-31	68367
2011-03-31	71249
2011-06-30	79996
2011-09-30	72304
2011-12-31	71674
2012-03-31	72674
2012-06-30	69070
2012-09-30	70395
2012-12-31	70347
2013-03-31	72633
2013-06-30	69199
2013-09-30	75053
2013-12-31	67595
2014-03-31	67341
2014-06-30	69120
2014-09-30	67753
2014-12-31	65298
2015-03-31	59951
2015-06-30	60288
2015-09-30	53722
2015-12-31	52000
2016-03-31	53247
2016-06-30	55548
2016-09-30	30871
2016-12-31	28983
2017-03-31	30192
2017-06-30	31234
2017-09-30	31003
2017-12-31	29564
2018-03-31	31692
2018-06-30	28851
2018-09-30	29582
2018-12-31	29334
2019-03-31	31329
2019-06-30	33942
2019-09-30	32541
2019-12-31	32454
2020-03-31	29345
2020-06-30	29670
2020-09-30	27295
2020-12-31	27695
2021-03-31	27518
2021-06-30	28590
2021-09-30	28741
2021-12-31	27942
2022-03-31	30804
2022-06-30	30875
2022-09-30	31202
2022-12-31	31524
2023-03-31	34168
2023-06-30	35754
2023-09-30	35827