Quarter	US dollars
2004-12-31	42357
2005-03-31	49387
2005-06-30	48021
2005-09-30	54047
2005-12-31	51051
2006-03-31	61632
2006-06-30	59433
2006-09-30	61309
2006-12-31	64939
2007-03-31	52208
2007-06-30	62026
2007-09-30	87871
2007-12-31	78503
2008-03-31	80643
2008-06-30	72312
2008-09-30	88093
2008-12-31	75891
2009-03-31	71108
2009-06-30	66742
2009-09-30	67580
2009-12-31	59996
2010-03-31	64775
2010-06-30	68071
2010-09-30	60685
2010-12-31	64400
2011-03-31	65768
2011-06-30	53116
2011-09-30	49632
2011-12-31	52218
2012-03-31	48160
2012-06-30	50249
2012-09-30	47050
2012-12-31	43660
2013-03-31	43029
2013-06-30	38385
2013-09-30	38720
2013-12-31	39105
2014-03-31	39142
2014-06-30	45259
2014-09-30	48790
2014-12-31	51595
2015-03-31	51917
2015-06-30	47112
2015-09-30	54799
2015-12-31	47725
2016-03-31	52866
2016-06-30	59114
2016-09-30	54982
2016-12-31	56762
2017-03-31	61436
2017-06-30	65181
2017-09-30	66315
2017-12-31	69179
2018-03-31	43818
2018-06-30	41067
2018-09-30	44724
2018-12-31	44296
2019-03-31	44690
2019-06-30	44349
2019-09-30	48731
2019-12-31	53712
2020-03-31	57441
2020-06-30	43498
2020-09-30	34205
2020-12-31	34031
2021-03-31	38016
2021-06-30	35791
2021-09-30	34578
2021-12-31	52965
2022-03-31	45121
2022-06-30	41989
2022-09-30	28496
2022-12-31	28064
2023-03-31	35470
2023-06-30	35866
2023-09-30	38149