Quarter	US dollars
1999-03-31	1482569
1999-06-30	1445314
1999-09-30	1524981
1999-12-31	1488371
2000-03-31	1607058
2000-06-30	1625350
2000-09-30	1615150
2000-12-31	1722672
2001-03-31	1830518
2001-06-30	1736280
2001-09-30	1817867
2001-12-31	1827665
2002-03-31	1741880
2002-06-30	1865621
2002-09-30	1921835
2002-12-31	2076562
2003-03-31	2188846
2003-06-30	2357677
2003-09-30	2320716
2003-12-31	2503233
2004-03-31	2788851
2004-06-30	2754478
2004-09-30	2820051
2004-12-31	2988979
2005-03-31	3149464
2005-06-30	3181453
2005-09-30	3205711
2005-12-31	3178396
2006-03-31	3510676
2006-06-30	3666523
2006-09-30	3830349
2006-12-31	3970274
2007-03-31	4552441
2007-06-30	4723361
2007-09-30	5056286
2007-12-31	5249693
2008-03-31	5779550
2008-06-30	5216645
2008-09-30	5008895
2008-12-31	4460836
2009-03-31	4276121
2009-06-30	4398170
2009-09-30	4368382
2009-12-31	4211252
2010-03-31	4223794
2010-06-30	4075689
2010-09-30	4446025
2010-12-31	4220140
2011-03-31	4400317
2011-06-30	4419434
2011-09-30	4684398
2011-12-31	4433048
2012-03-31	4615195
2012-06-30	4363221
2012-09-30	4342726
2012-12-31	4225362
2013-03-31	4006303
2013-06-30	3938065
2013-09-30	3764084
2013-12-31	3676811
2014-03-31	3709447
2014-06-30	3701656
2014-09-30	3592728
2014-12-31	3516868
2015-03-31	3384567
2015-06-30	3323276
2015-09-30	3322196
2015-12-31	3254718
2016-03-31	3291050
2016-06-30	3359571
2016-09-30	3360860
2016-12-31	3181114
2017-03-31	3226313
2017-06-30	3356635
2017-09-30	3517999
2017-12-31	3639366
2018-03-31	3827997
2018-06-30	3603491
2018-09-30	3527948
2018-12-31	3643873
2019-03-31	3572391
2019-06-30	3578539
2019-09-30	3565366
2019-12-31	3540839
2020-03-31	3966735
2020-06-30	3742694
2020-09-30	3857949
2020-12-31	4040226
2021-03-31	4038767
2021-06-30	4041177
2021-09-30	3988198
2021-12-31	4057549
2022-03-31	4202594
2022-06-30	4128458
2022-09-30	4049160
2022-12-31	3999501
2023-03-31	4094499
2023-06-30	4026044
2023-09-30	4086059