Quarter	US dollars
1999-03-31	458513
1999-06-30	475883
1999-09-30	491508
1999-12-31	484945
2000-03-31	538902
2000-06-30	545808
2000-09-30	566873
2000-12-31	567567
2001-03-31	628559
2001-06-30	619859
2001-09-30	652898
2001-12-31	634043
2002-03-31	641405
2002-06-30	707010
2002-09-30	728725
2002-12-31	740906
2003-03-31	850620
2003-06-30	890171
2003-09-30	932282
2003-12-31	926528
2004-03-31	1044833
2004-06-30	1001466
2004-09-30	1066711
2004-12-31	1153991
2005-03-31	1225710
2005-06-30	1262618
2005-09-30	1292502
2005-12-31	1260691
2006-03-31	1416181
2006-06-30	1462546
2006-09-30	1577706
2006-12-31	1701890
2007-03-31	1933284
2007-06-30	2074298
2007-09-30	2202167
2007-12-31	2161921
2008-03-31	2294636
2008-06-30	2104667
2008-09-30	2069666
2008-12-31	1722424
2009-03-31	1667529
2009-06-30	1668780
2009-09-30	1737363
2009-12-31	1579198
2010-03-31	1622160
2010-06-30	1551266
2010-09-30	1746925
2010-12-31	1761499
2011-03-31	1877614
2011-06-30	1939148
2011-09-30	1895415
2011-12-31	1821084
2012-03-31	1880309
2012-06-30	1853491
2012-09-30	1838375
2012-12-31	1814048
2013-03-31	1743915
2013-06-30	1739585
2013-09-30	1635041
2013-12-31	1637224
2014-03-31	1635406
2014-06-30	1659248
2014-09-30	1612496
2014-12-31	1583519
2015-03-31	1558775
2015-06-30	1474694
2015-09-30	1498037
2015-12-31	1426691
2016-03-31	1496123
2016-06-30	1484687
2016-09-30	1450385
2016-12-31	1299088
2017-03-31	1366751
2017-06-30	1393856
2017-09-30	1457537
2017-12-31	1480104
2018-03-31	1629612
2018-06-30	1506116
2018-09-30	1490803
2018-12-31	1585039
2019-03-31	1562841
2019-06-30	1559483
2019-09-30	1587848
2019-12-31	1588022
2020-03-31	1817102
2020-06-30	1689245
2020-09-30	1717621
2020-12-31	1774452
2021-03-31	1725990
2021-06-30	1713339
2021-09-30	1686986
2021-12-31	1714830
2022-03-31	1741437
2022-06-30	1663272
2022-09-30	1651606
2022-12-31	1641719
2023-03-31	1662897
2023-06-30	1629331
2023-09-30	1679239