Quarter	US dollars
1999-03-31	205326
1999-06-30	174990
1999-09-30	180927
1999-12-31	179858
2000-03-31	185534
2000-06-30	211042
2000-09-30	216258
2000-12-31	211934
2001-03-31	209433
2001-06-30	213044
2001-09-30	244935
2001-12-31	264771
2002-03-31	246231
2002-06-30	245417
2002-09-30	262649
2002-12-31	257766
2003-03-31	258261
2003-06-30	282606
2003-09-30	274914
2003-12-31	296452
2004-03-31	309985
2004-06-30	324102
2004-09-30	341161
2004-12-31	325711
2005-03-31	322772
2005-06-30	373117
2005-09-30	338506
2005-12-31	359446
2006-03-31	427099
2006-06-30	458489
2006-09-30	449632
2006-12-31	462263
2007-03-31	527265
2007-06-30	526779
2007-09-30	548613
2007-12-31	625209
2008-03-31	787494
2008-06-30	669216
2008-09-30	653433
2008-12-31	752842
2009-03-31	807253
2009-06-30	720610
2009-09-30	685721
2009-12-31	694066
2010-03-31	718918
2010-06-30	691943
2010-09-30	717432
2010-12-31	748495
2011-03-31	809483
2011-06-30	810831
2011-09-30	1198539
2011-12-31	1165560
2012-03-31	1120562
2012-06-30	931952
2012-09-30	945950
2012-12-31	964147
2013-03-31	940807
2013-06-30	907125
2013-09-30	919435
2013-12-31	938388
2014-03-31	935264
2014-06-30	962932
2014-09-30	964956
2014-12-31	963921
2015-03-31	927375
2015-06-30	947686
2015-09-30	941359
2015-12-31	902555
2016-03-31	930477
2016-06-30	958244
2016-09-30	926554
2016-12-31	934850
2017-03-31	944342
2017-06-30	991497
2017-09-30	1033263
2017-12-31	1068295
2018-03-31	1130633
2018-06-30	1071637
2018-09-30	1017154
2018-12-31	1081545
2019-03-31	1149571
2019-06-30	1116300
2019-09-30	1099831
2019-12-31	1040431
2020-03-31	1240668
2020-06-30	1179535
2020-09-30	1207656
2020-12-31	1328480
2021-03-31	1435854
2021-06-30	1384302
2021-09-30	1338140
2021-12-31	1299191
2022-03-31	1382557
2022-06-30	1326692
2022-09-30	1288312
2022-12-31	1234879
2023-03-31	1255549
2023-06-30	1165334
2023-09-30	1159349