Quarter	US dollars
2004-12-31	17573
2005-03-31	19948
2005-06-30	17970
2005-09-30	20060
2005-12-31	18958
2006-03-31	18857
2006-06-30	21309
2006-09-30	19183
2006-12-31	19824
2007-03-31	21992
2007-06-30	24197
2007-09-30	26146
2007-12-31	28932
2008-03-31	26879
2008-06-30	28299
2008-09-30	33972
2008-12-31	25667
2009-03-31	19519
2009-06-30	19001
2009-09-30	19684
2009-12-31	19297
2010-03-31	19972
2010-06-30	22652
2010-09-30	24567
2010-12-31	27535
2011-03-31	28720
2011-06-30	29315
2011-09-30	28499
2011-12-31	28467
2012-03-31	26393
2012-06-30	28639
2012-09-30	29814
2012-12-31	33733
2013-03-31	45232
2013-06-30	44268
2013-09-30	43353
2013-12-31	42227
2014-03-31	35268
2014-06-30	32987
2014-09-30	32807
2014-12-31	30131
2015-03-31	29842
2015-06-30	31145
2015-09-30	28793
2015-12-31	28196
2016-03-31	26387
2016-06-30	25366
2016-09-30	23707
2016-12-31	23638
2017-03-31	22989
2017-06-30	22384
2017-09-30	22868
2017-12-31	22389
2018-03-31	23312
2018-06-30	23991
2018-09-30	21695
2018-12-31	22936
2019-03-31	24549
2019-06-30	27907
2019-09-30	28115
2019-12-31	26843
2020-03-31	28163
2020-06-30	27977
2020-09-30	29212
2020-12-31	27353
2021-03-31	28431
2021-06-30	25893
2021-09-30	28511
2021-12-31	29364
2022-03-31	31557
2022-06-30	30730
2022-09-30	32029
2022-12-31	29652
2023-03-31	30365
2023-06-30	32480
2023-09-30	33582