Quarter	US dollars
1999-03-31	592979
1999-06-30	550304
1999-09-30	613575
1999-12-31	619274
2000-03-31	641419
2000-06-30	645747
2000-09-30	624748
2000-12-31	695065
2001-03-31	745437
2001-06-30	684547
2001-09-30	752423
2001-12-31	721329
2002-03-31	715345
2002-06-30	802171
2002-09-30	840485
2002-12-31	945758
2003-03-31	1034373
2003-06-30	1135965
2003-09-30	1080866
2003-12-31	1165557
2004-03-31	1267486
2004-06-30	1267490
2004-09-30	1278639
2004-12-31	1411546
2005-03-31	1512054
2005-06-30	1470273
2005-09-30	1518063
2005-12-31	1447649
2006-03-31	1610634
2006-06-30	1701405
2006-09-30	1707812
2006-12-31	1748601
2007-03-31	2097256
2007-06-30	2132820
2007-09-30	2225112
2007-12-31	2432872
2008-03-31	2581447
2008-06-30	2292147
2008-09-30	2094250
2008-12-31	1932633
2009-03-31	1775026
2009-06-30	1736122
2009-09-30	1746692
2009-12-31	1722052
2010-03-31	1628878
2010-06-30	1521520
2010-09-30	1626658
2010-12-31	1515853
2011-03-31	1612731
2011-06-30	1624327
2011-09-30	1616108
2011-12-31	1530176
2012-03-31	1606571
2012-06-30	1509020
2012-09-30	1513335
2012-12-31	1534231
2013-03-31	1433535
2013-06-30	1385469
2013-09-30	1361050
2013-12-31	1354723
2014-03-31	1413861
2014-06-30	1444164
2014-09-30	1303864
2014-12-31	1246324
2015-03-31	1200807
2015-06-30	1142793
2015-09-30	1105390
2015-12-31	1037680
2016-03-31	1020322
2016-06-30	1025058
2016-09-30	981992
2016-12-31	899878
2017-03-31	945969
2017-06-30	1019534
2017-09-30	1021326
2017-12-31	980900
2018-03-31	1033862
2018-06-30	999685
2018-09-30	984338
2018-12-31	963322
2019-03-31	1003497
2019-06-30	1016211
2019-09-30	996481
2019-12-31	934432
2020-03-31	1008466
2020-06-30	967092
2020-09-30	1048945
2020-12-31	1092296
2021-03-31	1103236
2021-06-30	1068746
2021-09-30	1046659
2021-12-31	1031599
2022-03-31	1030148
2022-06-30	939423
2022-09-30	874897
2022-12-31	918546
2023-03-31	971345
2023-06-30	962421
2023-09-30	966560