Quarter	US dollars
2004-12-31	20266
2005-03-31	19214
2005-06-30	18873
2005-09-30	19575
2005-12-31	19760
2006-03-31	19211
2006-06-30	19848
2006-09-30	19741
2006-12-31	20889
2007-03-31	20456
2007-06-30	21194
2007-09-30	23503
2007-12-31	23728
2008-03-31	30437
2008-06-30	31846
2008-09-30	33373
2008-12-31	30880
2009-03-31	31449
2009-06-30	34657
2009-09-30	37494
2009-12-31	38440
2010-03-31	39131
2010-06-30	43026
2010-09-30	47144
2010-12-31	50436
2011-03-31	54991
2011-06-30	57143
2011-09-30	54260
2011-12-31	55302
2012-03-31	57401
2012-06-30	59692
2012-09-30	67986
2012-12-31	67052
2013-03-31	65031
2013-06-30	64865
2013-09-30	70624
2013-12-31	70869
2014-03-31	74675
2014-06-30	76039
2014-09-30	78850
2014-12-31	75719
2015-03-31	73623
2015-06-30	72747
2015-09-30	68670
2015-12-31	59909
2016-03-31	60937
2016-06-30	60531
2016-09-30	61455
2016-12-31	60644
2017-03-31	61915
2017-06-30	66465
2017-09-30	66231
2017-12-31	68373
2018-03-31	66859
2018-06-30	66544
2018-09-30	66684
2018-12-31	65612
2019-03-31	69479
2019-06-30	72833
2019-09-30	72216
2019-12-31	72135
2020-03-31	69335
2020-06-30	66904
2020-09-30	69832
2020-12-31	73094
2021-03-31	72298
2021-06-30	71917
2021-09-30	72508
2021-12-31	77349
2022-03-31	77732
2022-06-30	75180
2022-09-30	71892
2022-12-31	71480
2023-03-31	73044
2023-06-30	71040
2023-09-30	71614