Quarter	US dollars
1999-03-31	1148874
1999-06-30	1129172
1999-09-30	1197971
1999-12-31	1158516
2000-03-31	1261073
2000-06-30	1280400
2000-09-30	1255913
2000-12-31	1344243
2001-03-31	1439194
2001-06-30	1369419
2001-09-30	1437394
2001-12-31	1436795
2002-03-31	1438326
2002-06-30	1550576
2002-09-30	1598677
2002-12-31	1725669
2003-03-31	1850336
2003-06-30	2010233
2003-09-30	1958726
2003-12-31	2079701
2004-03-31	2299592
2004-06-30	2287418
2004-09-30	2351622
2004-12-31	2544134
2005-03-31	2701566
2005-06-30	2676380
2005-09-30	2739344
2005-12-31	2660096
2006-03-31	2965287
2006-06-30	3078935
2006-09-30	3100565
2006-12-31	3174003
2007-03-31	3671259
2007-06-30	3766374
2007-09-30	4016706
2007-12-31	4259763
2008-03-31	4710977
2008-06-30	4227551
2008-09-30	4054780
2008-12-31	3606277
2009-03-31	3478363
2009-06-30	3501766
2009-09-30	3504516
2009-12-31	3452174
2010-03-31	3462859
2010-06-30	3334457
2010-09-30	3534497
2010-12-31	3485634
2011-03-31	3591386
2011-06-30	3623856
2011-09-30	3690180
2011-12-31	3565698
2012-03-31	3698400
2012-06-30	3550188
2012-09-30	3631036
2012-12-31	3629069
2013-03-31	3450601
2013-06-30	3384176
2013-09-30	3259287
2013-12-31	3232467
2014-03-31	3209270
2014-06-30	3194976
2014-09-30	3043187
2014-12-31	2931948
2015-03-31	2786560
2015-06-30	2734952
2015-09-30	2651895
2015-12-31	2603923
2016-03-31	2604671
2016-06-30	2654848
2016-09-30	2539128
2016-12-31	2418184
2017-03-31	2490018
2017-06-30	2661563
2017-09-30	2704972
2017-12-31	2818371
2018-03-31	2930608
2018-06-30	2760208
2018-09-30	2706986
2018-12-31	2775185
2019-03-31	2832613
2019-06-30	2803018
2019-09-30	2851223
2019-12-31	2790001
2020-03-31	3104426
2020-06-30	2992904
2020-09-30	3142067
2020-12-31	3411945
2021-03-31	3403794
2021-06-30	3316736
2021-09-30	3265547
2021-12-31	3327365
2022-03-31	3423643
2022-06-30	3314012
2022-09-30	3155403
2022-12-31	3196384
2023-03-31	3234199
2023-06-30	3179686
2023-09-30	3188854