Quarter	US dollars
2004-12-31	4690
2005-03-31	5248
2005-06-30	4772
2005-09-30	6835
2005-12-31	7744
2006-03-31	7634
2006-06-30	9482
2006-09-30	9231
2006-12-31	9519
2007-03-31	11274
2007-06-30	11410
2007-09-30	12436
2007-12-31	13455
2008-03-31	15471
2008-06-30	17119
2008-09-30	17910
2008-12-31	16929
2009-03-31	15962
2009-06-30	15353
2009-09-30	17256
2009-12-31	18280
2010-03-31	17894
2010-06-30	18357
2010-09-30	18908
2010-12-31	20564
2011-03-31	20167
2011-06-30	19748
2011-09-30	19042
2011-12-31	18895
2012-03-31	24464
2012-06-30	24291
2012-09-30	24311
2012-12-31	24535
2013-03-31	39940
2013-06-30	40699
2013-09-30	40051
2013-12-31	36319
2014-03-31	37139
2014-06-30	35290
2014-09-30	35910
2014-12-31	34416
2015-03-31	35499
2015-06-30	36205
2015-09-30	35626
2015-12-31	34361
2016-03-31	35433
2016-06-30	33391
2016-09-30	33745
2016-12-31	32292
2017-03-31	33988
2017-06-30	25967
2017-09-30	25049
2017-12-31	24641
2018-03-31	24932
2018-06-30	25648
2018-09-30	24398
2018-12-31	23709
2019-03-31	25769
2019-06-30	27813
2019-09-30	28739
2019-12-31	28929
2020-03-31	29857
2020-06-30	27138
2020-09-30	26965
2020-12-31	27021
2021-03-31	26830
2021-06-30	26794
2021-09-30	26102
2021-12-31	25842
2022-03-31	26962
2022-06-30	26498
2022-09-30	27015
2022-12-31	25479
2023-03-31	26869
2023-06-30	23932
2023-09-30	24908