Quarter	US dollars
2004-12-31	4782
2005-03-31	5528
2005-06-30	4974
2005-09-30	6911
2005-12-31	8116
2006-03-31	8095
2006-06-30	10141
2006-09-30	10008
2006-12-31	10646
2007-03-31	12209
2007-06-30	13230
2007-09-30	14537
2007-12-31	15656
2008-03-31	17987
2008-06-30	19390
2008-09-30	20665
2008-12-31	19055
2009-03-31	18122
2009-06-30	17295
2009-09-30	18964
2009-12-31	20025
2010-03-31	19547
2010-06-30	20341
2010-09-30	21134
2010-12-31	22826
2011-03-31	22186
2011-06-30	21763
2011-09-30	20980
2011-12-31	21169
2012-03-31	26739
2012-06-30	26572
2012-09-30	26018
2012-12-31	26060
2013-03-31	41163
2013-06-30	41923
2013-09-30	41546
2013-12-31	37947
2014-03-31	38760
2014-06-30	37227
2014-09-30	38471
2014-12-31	37135
2015-03-31	38250
2015-06-30	38954
2015-09-30	38472
2015-12-31	36793
2016-03-31	37619
2016-06-30	35671
2016-09-30	36031
2016-12-31	34693
2017-03-31	35556
2017-06-30	27773
2017-09-30	27445
2017-12-31	26957
2018-03-31	27195
2018-06-30	28460
2018-09-30	27093
2018-12-31	26480
2019-03-31	28648
2019-06-30	30429
2019-09-30	31192
2019-12-31	31510
2020-03-31	32624
2020-06-30	29791
2020-09-30	29543
2020-12-31	28354
2021-03-31	28173
2021-06-30	28220
2021-09-30	27602
2021-12-31	27411
2022-03-31	28167
2022-06-30	27616
2022-09-30	28225
2022-12-31	26456
2023-03-31	27824
2023-06-30	24788
2023-09-30	25692