Quarter	US dollars
2004-12-31	20533
2005-03-31	23416
2005-06-30	22467
2005-09-30	22989
2005-12-31	14316
2006-03-31	18273
2006-06-30	16669
2006-09-30	24133
2006-12-31	19899
2007-03-31	31028
2007-06-30	24512
2007-09-30	40224
2007-12-31	25788
2008-03-31	30049
2008-06-30	31509
2008-09-30	28433
2008-12-31	17690
2009-03-31	18795
2009-06-30	23324
2009-09-30	17391
2009-12-31	21701
2010-03-31	21411
2010-06-30	21740
2010-09-30	23971
2010-12-31	30610
2011-03-31	41579
2011-06-30	32733
2011-09-30	30309
2011-12-31	24901
2012-03-31	23503
2012-06-30	23254
2012-09-30	25690
2012-12-31	25141
2013-03-31	26040
2013-06-30	30066
2013-09-30	30349
2013-12-31	31155
2014-03-31	27692
2014-06-30	32149
2014-09-30	31445
2014-12-31	33763
2015-03-31	31562
2015-06-30	23452
2015-09-30	23654
2015-12-31	20924
2016-03-31	27623
2016-06-30	25627
2016-09-30	22706
2016-12-31	25396
2017-03-31	26601
2017-06-30	27562
2017-09-30	27006
2017-12-31	24857
2018-03-31	26402
2018-06-30	28408
2018-09-30	27227
2018-12-31	25802
2019-03-31	21628
2019-06-30	27368
2019-09-30	22892
2019-12-31	18884
2020-03-31	26423
2020-06-30	23546
2020-09-30	19770
2020-12-31	17353
2021-03-31	25128
2021-06-30	20173
2021-09-30	21992
2021-12-31	19257
2022-03-31	25782
2022-06-30	26660
2022-09-30	26280
2022-12-31	24251
2023-03-31	29048
2023-06-30	29304
2023-09-30	28801