Quarter	US dollars
2004-12-31	1465
2005-03-31	1510
2005-06-30	1599
2005-09-30	2061
2005-12-31	1881
2006-03-31	2257
2006-06-30	2389
2006-09-30	3314
2006-12-31	3867
2007-03-31	5178
2007-06-30	5371
2007-09-30	4570
2007-12-31	4265
2008-03-31	4023
2008-06-30	4900
2008-09-30	5498
2008-12-31	4060
2009-03-31	3846
2009-06-30	4315
2009-09-30	4632
2009-12-31	5471
2010-03-31	5539
2010-06-30	5482
2010-09-30	5615
2010-12-31	5008
2011-03-31	4613
2011-06-30	5088
2011-09-30	3952
2011-12-31	4329
2012-03-31	4769
2012-06-30	4602
2012-09-30	4439
2012-12-31	3775
2013-03-31	3744
2013-06-30	3720
2013-09-30	3707
2013-12-31	3907
2014-03-31	4033
2014-06-30	4146
2014-09-30	4103
2014-12-31	3708
2015-03-31	3629
2015-06-30	3306
2015-09-30	3134
2015-12-31	3217
2016-03-31	2897
2016-06-30	2506
2016-09-30	2658
2016-12-31	2414
2017-03-31	2620
2017-06-30	1949
2017-09-30	1959
2017-12-31	1847
2018-03-31	2248
2018-06-30	2105
2018-09-30	1720
2018-12-31	1803
2019-03-31	1785
2019-06-30	1746
2019-09-30	1880
2019-12-31	2198
2020-03-31	2018
2020-06-30	1985
2020-09-30	1861
2020-12-31	1324
2021-03-31	1345
2021-06-30	988
2021-09-30	1137
2021-12-31	991
2022-03-31	1177
2022-06-30	1264
2022-09-30	1153
2022-12-31	1251
2023-03-31	1255
2023-06-30	1289
2023-09-30	1140