Quarter	US dollars
2004-12-31	13770
2005-03-31	18085
2005-06-30	13180
2005-09-30	13071
2005-12-31	18411
2006-03-31	19699
2006-06-30	21309
2006-09-30	25719
2006-12-31	27598
2007-03-31	28217
2007-06-30	27698
2007-09-30	29033
2007-12-31	27458
2008-03-31	28602
2008-06-30	22042
2008-09-30	18807
2008-12-31	16846
2009-03-31	14367
2009-06-30	14284
2009-09-30	8908
2009-12-31	6412
2010-03-31	7740
2010-06-30	7285
2010-09-30	9754
2010-12-31	9662
2011-03-31	9406
2011-06-30	8889
2011-09-30	8596
2011-12-31	6017
2012-03-31	5879
2012-06-30	8138
2012-09-30	8425
2012-12-31	6331
2013-03-31	6636
2013-06-30	6247
2013-09-30	6055
2013-12-31	5297
2014-03-31	6127
2014-06-30	6042
2014-09-30	6321
2014-12-31	5850
2015-03-31	5320
2015-06-30	5073
2015-09-30	4476
2015-12-31	3838
2016-03-31	3846
2016-06-30	4390
2016-09-30	4109
2016-12-31	4245
2017-03-31	4372
2017-06-30	4761
2017-09-30	5734
2017-12-31	4038
2018-03-31	4517
2018-06-30	5646
2018-09-30	4786
2018-12-31	4627
2019-03-31	4617
2019-06-30	2586
2019-09-30	3910
2019-12-31	3808
2020-03-31	4166
2020-06-30	3331
2020-09-30	3125
2020-12-31	2985
2021-03-31	2991
2021-06-30	2570
2021-09-30	3629
2021-12-31	3527
2022-03-31	3925
2022-06-30	2229
2022-09-30	3327
2022-12-31	2349
2023-03-31	2730
2023-06-30	3534
2023-09-30	3831