Quarter	US dollars
2004-12-31	12201
2005-03-31	12615
2005-06-30	13257
2005-09-30	13503
2005-12-31	13877
2006-03-31	14918
2006-06-30	15219
2006-09-30	15738
2006-12-31	15805
2007-03-31	16651
2007-06-30	17004
2007-09-30	18699
2007-12-31	17550
2008-03-31	19042
2008-06-30	17067
2008-09-30	17956
2008-12-31	17363
2009-03-31	17088
2009-06-30	16692
2009-09-30	17117
2009-12-31	17109
2010-03-31	18155
2010-06-30	19510
2010-09-30	22104
2010-12-31	23102
2011-03-31	23987
2011-06-30	25648
2011-09-30	24274
2011-12-31	24042
2012-03-31	26126
2012-06-30	25744
2012-09-30	27298
2012-12-31	28572
2013-03-31	29415
2013-06-30	29435
2013-09-30	28655
2013-12-31	28878
2014-03-31	27994
2014-06-30	28451
2014-09-30	28715
2014-12-31	27351
2015-03-31	25883
2015-06-30	25992
2015-09-30	23379
2015-12-31	24613
2016-03-31	25747
2016-06-30	23740
2016-09-30	22771
2016-12-31	21861
2017-03-31	21876
2017-06-30	21875
2017-09-30	22837
2017-12-31	23230
2018-03-31	24973
2018-06-30	23788
2018-09-30	22663
2018-12-31	23296
2019-03-31	23532
2019-06-30	23231
2019-09-30	23036
2019-12-31	22400
2020-03-31	21230
2020-06-30	21496
2020-09-30	21313
2020-12-31	22129
2021-03-31	21066
2021-06-30	21245
2021-09-30	20420
2021-12-31	20989
2022-03-31	20745
2022-06-30	19921
2022-09-30	19227
2022-12-31	19786
2023-03-31	18941
2023-06-30	17611
2023-09-30	17795