Quarter	US dollars
1999-03-31	302216
1999-06-30	296956
1999-09-30	292239
1999-12-31	271344
2000-03-31	308086
2000-06-30	309339
2000-09-30	288778
2000-12-31	285761
2001-03-31	326459
2001-06-30	320682
2001-09-30	325344
2001-12-31	323751
2002-03-31	348382
2002-06-30	358573
2002-09-30	386131
2002-12-31	393345
2003-03-31	447525
2003-06-30	467069
2003-09-30	494081
2003-12-31	537795
2004-03-31	617867
2004-06-30	586400
2004-09-30	645046
2004-12-31	695055
2005-03-31	759214
2005-06-30	731399
2005-09-30	739587
2005-12-31	701387
2006-03-31	804568
2006-06-30	857336
2006-09-30	903802
2006-12-31	865090
2007-03-31	1001271
2007-06-30	1079759
2007-09-30	1130964
2007-12-31	1165208
2008-03-31	1279939
2008-06-30	1312014
2008-09-30	1256222
2008-12-31	987755
2009-03-31	1051688
2009-06-30	1055650
2009-09-30	1070094
2009-12-31	1013194
2010-03-31	1074006
2010-06-30	1075604
2010-09-30	1168114
2010-12-31	1176995
2011-03-31	1259396
2011-06-30	1311402
2011-09-30	1265725
2011-12-31	1218433
2012-03-31	1308735
2012-06-30	1294340
2012-09-30	1309952
2012-12-31	1318625
2013-03-31	1311781
2013-06-30	1390934
2013-09-30	1341248
2013-12-31	1295811
2014-03-31	1280451
2014-06-30	1250129
2014-09-30	1215558
2014-12-31	1184793
2015-03-31	1142694
2015-06-30	1139266
2015-09-30	1126010
2015-12-31	1056107
2016-03-31	1044110
2016-06-30	1115657
2016-09-30	1115768
2016-12-31	1051589
2017-03-31	1089442
2017-06-30	1159949
2017-09-30	1238758
2017-12-31	1336135
2018-03-31	1398935
2018-06-30	1306274
2018-09-30	1298449
2018-12-31	1385419
2019-03-31	1311166
2019-06-30	1258705
2019-09-30	1292453
2019-12-31	1314492
2020-03-31	1464124
2020-06-30	1357148
2020-09-30	1459283
2020-12-31	1546210
2021-03-31	1499162
2021-06-30	1487151
2021-09-30	1462912
2021-12-31	1510365
2022-03-31	1535609
2022-06-30	1478137
2022-09-30	1434775
2022-12-31	1440224
2023-03-31	1422875
2023-06-30	1377012
2023-09-30	1374436