Quarter	US dollars
2004-12-31	6418
2005-03-31	6974
2005-06-30	6451
2005-09-30	7411
2005-12-31	7302
2006-03-31	7777
2006-06-30	7333
2006-09-30	7637
2006-12-31	8063
2007-03-31	8218
2007-06-30	9035
2007-09-30	17619
2007-12-31	18040
2008-03-31	17647
2008-06-30	17441
2008-09-30	18056
2008-12-31	17530
2009-03-31	16452
2009-06-30	16471
2009-09-30	17167
2009-12-31	17973
2010-03-31	19878
2010-06-30	20691
2010-09-30	21343
2010-12-31	22852
2011-03-31	22652
2011-06-30	24712
2011-09-30	23442
2011-12-31	22576
2012-03-31	23614
2012-06-30	21711
2012-09-30	23326
2012-12-31	23059
2013-03-31	21493
2013-06-30	22214
2013-09-30	23188
2013-12-31	24248
2014-03-31	22860
2014-06-30	24625
2014-09-30	23780
2014-12-31	22555
2015-03-31	21971
2015-06-30	21741
2015-09-30	19765
2015-12-31	19526
2016-03-31	19948
2016-06-30	19802
2016-09-30	21514
2016-12-31	21619
2017-03-31	23368
2017-06-30	22942
2017-09-30	23647
2017-12-31	24145
2018-03-31	25871
2018-06-30	25855
2018-09-30	26506
2018-12-31	26353
2019-03-31	26988
2019-06-30	27271
2019-09-30	29189
2019-12-31	29664
2020-03-31	28419
2020-06-30	27954
2020-09-30	28983
2020-12-31	33155
2021-03-31	31838
2021-06-30	33284
2021-09-30	32537
2021-12-31	35102
2022-03-31	31993
2022-06-30	30875
2022-09-30	27335
2022-12-31	27050
2023-03-31	28831
2023-06-30	29354
2023-09-30	28646