Quarter	US dollars
2004-12-31	7442
2005-03-31	10117
2005-06-30	7677
2005-09-30	14297
2005-12-31	7565
2006-03-31	8074
2006-06-30	7688
2006-09-30	10879
2006-12-31	8664
2007-03-31	9569
2007-06-30	8945
2007-09-30	12905
2007-12-31	12811
2008-03-31	14874
2008-06-30	15555
2008-09-30	16871
2008-12-31	11869
2009-03-31	9692
2009-06-30	9461
2009-09-30	14746
2009-12-31	13062
2010-03-31	22700
2010-06-30	22202
2010-09-30	25047
2010-12-31	35814
2011-03-31	36068
2011-06-30	48627
2011-09-30	45899
2011-12-31	50884
2012-03-31	57313
2012-06-30	54625
2012-09-30	46168
2012-12-31	41355
2013-03-31	59030
2013-06-30	62547
2013-09-30	59272
2013-12-31	62520
2014-03-31	79934
2014-06-30	71067
2014-09-30	62632
2014-12-31	49989
2015-03-31	51480
2015-06-30	48338
2015-09-30	43237
2015-12-31	38851
2016-03-31	31703
2016-06-30	29921
2016-09-30	31931
2016-12-31	35970
2017-03-31	41805
2017-06-30	56881
2017-09-30	51397
2017-12-31	60026
2018-03-31	56681
2018-06-30	53504
2018-09-30	48869
2018-12-31	45556
2019-03-31	48199
2019-06-30	51202
2019-09-30	47588
2019-12-31	48172
2020-03-31	44852
2020-06-30	49110
2020-09-30	43109
2020-12-31	54435
2021-03-31	62548
2021-06-30	62545
2021-09-30	65062
2021-12-31	65089
2022-03-31	54321
2022-06-30	49055
2022-09-30	50187
2022-12-31	50378
2023-03-31	48816
2023-06-30	43752
2023-09-30	48014