Quarter	US dollars
2004-12-31	3398
2005-03-31	3881
2005-06-30	3816
2005-09-30	3612
2005-12-31	3365
2006-03-31	3712
2006-06-30	3876
2006-09-30	4426
2006-12-31	4364
2007-03-31	4283
2007-06-30	3822
2007-09-30	4959
2007-12-31	4428
2008-03-31	5458
2008-06-30	5164
2008-09-30	4220
2008-12-31	4078
2009-03-31	3739
2009-06-30	3620
2009-09-30	3738
2009-12-31	3139
2010-03-31	4652
2010-06-30	5820
2010-09-30	6160
2010-12-31	7882
2011-03-31	11657
2011-06-30	13638
2011-09-30	13499
2011-12-31	11271
2012-03-31	14605
2012-06-30	11503
2012-09-30	13773
2012-12-31	16627
2013-03-31	9253
2013-06-30	9499
2013-09-30	9511
2013-12-31	11469
2014-03-31	10342
2014-06-30	9089
2014-09-30	7706
2014-12-31	10699
2015-03-31	11137
2015-06-30	8634
2015-09-30	7773
2015-12-31	8551
2016-03-31	6341
2016-06-30	5263
2016-09-30	7991
2016-12-31	4354
2017-03-31	5273
2017-06-30	4211
2017-09-30	4190
2017-12-31	3124
2018-03-31	3970
2018-06-30	2973
2018-09-30	4114
2018-12-31	3760
2019-03-31	4912
2019-06-30	5274
2019-09-30	3718
2019-12-31	3539
2020-03-31	3510
2020-06-30	3098
2020-09-30	2833
2020-12-31	2898
2021-03-31	2741
2021-06-30	2833
2021-09-30	2668
2021-12-31	2585
2022-03-31	2940
2022-06-30	3066
2022-09-30	2811
2022-12-31	2037
2023-03-31	2965
2023-06-30	2731
2023-09-30	3670