Quarter	US dollars
2004-12-31	15075
2005-03-31	15600
2005-06-30	16654
2005-09-30	17449
2005-12-31	18196
2006-03-31	18585
2006-06-30	18150
2006-09-30	19340
2006-12-31	20085
2007-03-31	21133
2007-06-30	22604
2007-09-30	28835
2007-12-31	32412
2008-03-31	38464
2008-06-30	37886
2008-09-30	35740
2008-12-31	36608
2009-03-31	36402
2009-06-30	37811
2009-09-30	38663
2009-12-31	31866
2010-03-31	36528
2010-06-30	37893
2010-09-30	42301
2010-12-31	43967
2011-03-31	46163
2011-06-30	46392
2011-09-30	43802
2011-12-31	44019
2012-03-31	46869
2012-06-30	40352
2012-09-30	37952
2012-12-31	37049
2013-03-31	35332
2013-06-30	34617
2013-09-30	36681
2013-12-31	36024
2014-03-31	34100
2014-06-30	33069
2014-09-30	30068
2014-12-31	28556
2015-03-31	23365
2015-06-30	23850
2015-09-30	23176
2015-12-31	20889
2016-03-31	20839
2016-06-30	20137
2016-09-30	16873
2016-12-31	15753
2017-03-31	15870
2017-06-30	16454
2017-09-30	16409
2017-12-31	16659
2018-03-31	17070
2018-06-30	15228
2018-09-30	15601
2018-12-31	14864
2019-03-31	14521
2019-06-30	12760
2019-09-30	10828
2019-12-31	10956
2020-03-31	10531
2020-06-30	10687
2020-09-30	10109
2020-12-31	10018
2021-03-31	9180
2021-06-30	8886
2021-09-30	9134
2021-12-31	7903
2022-03-31	8263
2022-06-30	7757
2022-09-30	6904
2022-12-31	6677
2023-03-31	7358
2023-06-30	8255
2023-09-30	8104