Quarter	US dollars
2004-12-31	2638
2005-03-31	2531
2005-06-30	2846
2005-09-30	2906
2005-12-31	3007
2006-03-31	3056
2006-06-30	3052
2006-09-30	3161
2006-12-31	3225
2007-03-31	3177
2007-06-30	3154
2007-09-30	3549
2007-12-31	3990
2008-03-31	4553
2008-06-30	4579
2008-09-30	5040
2008-12-31	4705
2009-03-31	5082
2009-06-30	5265
2009-09-30	5236
2009-12-31	5246
2010-03-31	5271
2010-06-30	5153
2010-09-30	5020
2010-12-31	5094
2011-03-31	5075
2011-06-30	5148
2011-09-30	5102
2011-12-31	5039
2012-03-31	5061
2012-06-30	6069
2012-09-30	6035
2012-12-31	6278
2013-03-31	6204
2013-06-30	6103
2013-09-30	6048
2013-12-31	5891
2014-03-31	6304
2014-06-30	5416
2014-09-30	5381
2014-12-31	5168
2015-03-31	4934
2015-06-30	4138
2015-09-30	4200
2015-12-31	3924
2016-03-31	3791
2016-06-30	3911
2016-09-30	3808
2016-12-31	3433
2017-03-31	3241
2017-06-30	3150
2017-09-30	3043
2017-12-31	2855
2018-03-31	2802
2018-06-30	2757
2018-09-30	2729
2018-12-31	2694
2019-03-31	2594
2019-06-30	2530
2019-09-30	2457
2019-12-31	2390
2020-03-31	2307
2020-06-30	1928
2020-09-30	1858
2020-12-31	1833
2021-03-31	2032
2021-06-30	2525
2021-09-30	2507
2021-12-31	2914
2022-03-31	2731
2022-06-30	2307
2022-09-30	2141
2022-12-31	1895
2023-03-31	1848
2023-06-30	1890
2023-09-30	1868