Quarter	US dollars
2004-12-31	1288
2005-03-31	1444
2005-06-30	1525
2005-09-30	1640
2005-12-31	1856
2006-03-31	2064
2006-06-30	2338
2006-09-30	2360
2006-12-31	2180
2007-03-31	2403
2007-06-30	2681
2007-09-30	3081
2007-12-31	3160
2008-03-31	3637
2008-06-30	4078
2008-09-30	4569
2008-12-31	4162
2009-03-31	4112
2009-06-30	4226
2009-09-30	4360
2009-12-31	4436
2010-03-31	4486
2010-06-30	4631
2010-09-30	4848
2010-12-31	4805
2011-03-31	4628
2011-06-30	4626
2011-09-30	4706
2011-12-31	4685
2012-03-31	4964
2012-06-30	4878
2012-09-30	4956
2012-12-31	4585
2013-03-31	4494
2013-06-30	4400
2013-09-30	4411
2013-12-31	4155
2014-03-31	4297
2014-06-30	4098
2014-09-30	3940
2014-12-31	3938
2015-03-31	3765
2015-06-30	4008
2015-09-30	4178
2015-12-31	3958
2016-03-31	3653
2016-06-30	3760
2016-09-30	3371
2016-12-31	2638
2017-03-31	2993
2017-06-30	2630
2017-09-30	2317
2017-12-31	2352
2018-03-31	2212
2018-06-30	2341
2018-09-30	2566
2018-12-31	2850
2019-03-31	2946
2019-06-30	3416
2019-09-30	2953
2019-12-31	3174
2020-03-31	2907
2020-06-30	3123
2020-09-30	3002
2020-12-31	2907
2021-03-31	2976
2021-06-30	3091
2021-09-30	3136
2021-12-31	2957
2022-03-31	2814
2022-06-30	2909
2022-09-30	2744
2022-12-31	2353
2023-03-31	2233
2023-06-30	2285
2023-09-30	2302