Quarter	US dollars
2004-12-31	7774
2005-03-31	6280
2005-06-30	5263
2005-09-30	6453
2005-12-31	6643
2006-03-31	4867
2006-06-30	6637
2006-09-30	4500
2006-12-31	7380
2007-03-31	7849
2007-06-30	7680
2007-09-30	6793
2007-12-31	5933
2008-03-31	6602
2008-06-30	6627
2008-09-30	9074
2008-12-31	5227
2009-03-31	4494
2009-06-30	3315
2009-09-30	5020
2009-12-31	9116
2010-03-31	7502
2010-06-30	9212
2010-09-30	9984
2010-12-31	9575
2011-03-31	8613
2011-06-30	7622
2011-09-30	6065
2011-12-31	4422
2012-03-31	3981
2012-06-30	3851
2012-09-30	4900
2012-12-31	4854
2013-03-31	3340
2013-06-30	2380
2013-09-30	2251
2013-12-31	2644
2014-03-31	1812
2014-06-30	2344
2014-09-30	841
2014-12-31	2639
2015-03-31	3097
2015-06-30	1851
2015-09-30	2575
2015-12-31	-1058
2016-03-31	109
2016-06-30	-526
2016-09-30	561
2016-12-31	1938
2017-03-31	1387
2017-06-30	1287
2017-09-30	1686
2017-12-31	1954
2018-03-31	1591
2018-06-30	1599
2018-09-30	3235
2018-12-31	959
2019-03-31	6875
2019-06-30	4600
2019-09-30	4837
2019-12-31	3992
2020-03-31	6654
2020-06-30	5785
2020-09-30	4552
2020-12-31	3913
2021-03-31	2287
2021-06-30	2820
2021-09-30	3704
2021-12-31	1283
2022-03-31	353
2022-06-30	549
2022-09-30	-139
2022-12-31	-102
2023-03-31	1661
2023-06-30	1693
2023-09-30	900