Quarter	US dollars
2004-12-31	20362
2005-03-31	23825
2005-06-30	21698
2005-09-30	21855
2005-12-31	23557
2006-03-31	22507
2006-06-30	22399
2006-09-30	23366
2006-12-31	26038
2007-03-31	31695
2007-06-30	34725
2007-09-30	36410
2007-12-31	29326
2008-03-31	33424
2008-06-30	32566
2008-09-30	32117
2008-12-31	18935
2009-03-31	15561
2009-06-30	20494
2009-09-30	15059
2009-12-31	17811
2010-03-31	16104
2010-06-30	15994
2010-09-30	16363
2010-12-31	14306
2011-03-31	16243
2011-06-30	14078
2011-09-30	10505
2011-12-31	6658
2012-03-31	5972
2012-06-30	5981
2012-09-30	8464
2012-12-31	11461
2013-03-31	12283
2013-06-30	6290
2013-09-30	7020
2013-12-31	7826
2014-03-31	7986
2014-06-30	10407
2014-09-30	11183
2014-12-31	11055
2015-03-31	7285
2015-06-30	5883
2015-09-30	6784
2015-12-31	4672
2016-03-31	5242
2016-06-30	5459
2016-09-30	4339
2016-12-31	7119
2017-03-31	8125
2017-06-30	6594
2017-09-30	5615
2017-12-31	5478
2018-03-31	6973
2018-06-30	6171
2018-09-30	6133
2018-12-31	5976
2019-03-31	7096
2019-06-30	7116
2019-09-30	5960
2019-12-31	8449
2020-03-31	10734
2020-06-30	9445
2020-09-30	10348
2020-12-31	8245
2021-03-31	7945
2021-06-30	10482
2021-09-30	11035
2021-12-31	10935
2022-03-31	9296
2022-06-30	9824
2022-09-30	10918
2022-12-31	8067
2023-03-31	11234
2023-06-30	9610
2023-09-30	7961