Quarter	US dollars
2004-12-31	48537
2005-03-31	57381
2005-06-30	49025
2005-09-30	55126
2005-12-31	51455
2006-03-31	58506
2006-06-30	59894
2006-09-30	58234
2006-12-31	61606
2007-03-31	57568
2007-06-30	56025
2007-09-30	65617
2007-12-31	51266
2008-03-31	45554
2008-06-30	44915
2008-09-30	36809
2008-12-31	44143
2009-03-31	41524
2009-06-30	44694
2009-09-30	40792
2009-12-31	44197
2010-03-31	42759
2010-06-30	46387
2010-09-30	58921
2010-12-31	65169
2011-03-31	54072
2011-06-30	47436
2011-09-30	39762
2011-12-31	43513
2012-03-31	44368
2012-06-30	20478
2012-09-30	23657
2012-12-31	20540
2013-03-31	22462
2013-06-30	18950
2013-09-30	18210
2013-12-31	17789
2014-03-31	18879
2014-06-30	19330
2014-09-30	17759
2014-12-31	14954
2015-03-31	36966
2015-06-30	35906
2015-09-30	44194
2015-12-31	36969
2016-03-31	38694
2016-06-30	37127
2016-09-30	33713
2016-12-31	32276
2017-03-31	36081
2017-06-30	40485
2017-09-30	44721
2017-12-31	44297
2018-03-31	47323
2018-06-30	43072
2018-09-30	44543
2018-12-31	40641
2019-03-31	37565
2019-06-30	35181
2019-09-30	37326
2019-12-31	36543
2020-03-31	36859
2020-06-30	34697
2020-09-30	32178
2020-12-31	29886
2021-03-31	25943
2021-06-30	27065
2021-09-30	30393
2021-12-31	31020
2022-03-31	30746
2022-06-30	27904
2022-09-30	28009
2022-12-31	27932
2023-03-31	32275
2023-06-30	43993
2023-09-30	40478