Quarter	US dollars
2004-12-31	18297
2005-03-31	13836
2005-06-30	13044
2005-09-30	16100
2005-12-31	14169
2006-03-31	19093
2006-06-30	18664
2006-09-30	17995
2006-12-31	18543
2007-03-31	21596
2007-06-30	20838
2007-09-30	24946
2007-12-31	23252
2008-03-31	23663
2008-06-30	18926
2008-09-30	25097
2008-12-31	15497
2009-03-31	17253
2009-06-30	16840
2009-09-30	21175
2009-12-31	15799
2010-03-31	21222
2010-06-30	20802
2010-09-30	21066
2010-12-31	16998
2011-03-31	20169
2011-06-30	16644
2011-09-30	23640
2011-12-31	14792
2012-03-31	15235
2012-06-30	13965
2012-09-30	13281
2012-12-31	14959
2013-03-31	12330
2013-06-30	15504
2013-09-30	14570
2013-12-31	13961
2014-03-31	13689
2014-06-30	14259
2014-09-30	13796
2014-12-31	12547
2015-03-31	15699
2015-06-30	12987
2015-09-30	12127
2015-12-31	11434
2016-03-31	11472
2016-06-30	11691
2016-09-30	11745
2016-12-31	10900
2017-03-31	11673
2017-06-30	12819
2017-09-30	11224
2017-12-31	12635
2018-03-31	15404
2018-06-30	12606
2018-09-30	11368
2018-12-31	8761
2019-03-31	12270
2019-06-30	10895
2019-09-30	12980
2019-12-31	11268
2020-03-31	12866
2020-06-30	11658
2020-09-30	13732
2020-12-31	15231
2021-03-31	12073
2021-06-30	12404
2021-09-30	13197
2021-12-31	12222
2022-03-31	10994
2022-06-30	10795
2022-09-30	10437
2022-12-31	9668
2023-03-31	10530
2023-06-30	12770
2023-09-30	11552