Quarter	US dollars
2004-12-31	4022
2005-03-31	4490
2005-06-30	4277
2005-09-30	5168
2005-12-31	4865
2006-03-31	6593
2006-06-30	6410
2006-09-30	7392
2006-12-31	6689
2007-03-31	7914
2007-06-30	7743
2007-09-30	11065
2007-12-31	11533
2008-03-31	14930
2008-06-30	13911
2008-09-30	16484
2008-12-31	10809
2009-03-31	9686
2009-06-30	12672
2009-09-30	14034
2009-12-31	12071
2010-03-31	12073
2010-06-30	14013
2010-09-30	15107
2010-12-31	14415
2011-03-31	18497
2011-06-30	17819
2011-09-30	17575
2011-12-31	20200
2012-03-31	23104
2012-06-30	23287
2012-09-30	30625
2012-12-31	25990
2013-03-31	33626
2013-06-30	26064
2013-09-30	24469
2013-12-31	23797
2014-03-31	21515
2014-06-30	22026
2014-09-30	22587
2014-12-31	17584
2015-03-31	17604
2015-06-30	17349
2015-09-30	17174
2015-12-31	15213
2016-03-31	16364
2016-06-30	19579
2016-09-30	20083
2016-12-31	17737
2017-03-31	18442
2017-06-30	16551
2017-09-30	14312
2017-12-31	15203
2018-03-31	15919
2018-06-30	8945
2018-09-30	8134
2018-12-31	8461
2019-03-31	8618
2019-06-30	8651
2019-09-30	7860
2019-12-31	7403
2020-03-31	7264
2020-06-30	6126
2020-09-30	6934
2020-12-31	7616
2021-03-31	8296
2021-06-30	8825
2021-09-30	9010
2021-12-31	8930
2022-03-31	14270
2022-06-30	14060
2022-09-30	16477
2022-12-31	11522
2023-03-31	9767
2023-06-30	9521
2023-09-30	11963