Quarter	US dollars
1999-03-31	759609
1999-06-30	713361
1999-09-30	777672
1999-12-31	756642
2000-03-31	797850
2000-06-30	800477
2000-09-30	768258
2000-12-31	825970
2001-03-31	883413
2001-06-30	823262
2001-09-30	893485
2001-12-31	860129
2002-03-31	862525
2002-06-30	963616
2002-09-30	1006607
2002-12-31	1126072
2003-03-31	1244808
2003-06-30	1364152
2003-09-30	1317621
2003-12-31	1438659
2004-03-31	1566148
2004-06-30	1554317
2004-09-30	1583467
2004-12-31	1735480
2005-03-31	1852262
2005-06-30	1815907
2005-09-30	1867110
2005-12-31	1771180
2006-03-31	1951840
2006-06-30	2078884
2006-09-30	2085271
2006-12-31	2135121
2007-03-31	2540840
2007-06-30	2608955
2007-09-30	2702015
2007-12-31	2946022
2008-03-31	3164370
2008-06-30	2864298
2008-09-30	2602111
2008-12-31	2408455
2009-03-31	2282079
2009-06-30	2245712
2009-09-30	2227677
2009-12-31	2172629
2010-03-31	2105157
2010-06-30	1974165
2010-09-30	2142566
2010-12-31	2018607
2011-03-31	2135042
2011-06-30	2171250
2011-09-30	2169003
2011-12-31	2041790
2012-03-31	2143632
2012-06-30	2070088
2012-09-30	2071555
2012-12-31	2124509
2013-03-31	2004845
2013-06-30	1945508
2013-09-30	1916119
2013-12-31	1953552
2014-03-31	1968033
2014-06-30	2001342
2014-09-30	1837246
2014-12-31	1768059
2015-03-31	1714759
2015-06-30	1689633
2015-09-30	1640879
2015-12-31	1551044
2016-03-31	1543806
2016-06-30	1536437
2016-09-30	1502594
2016-12-31	1390876
2017-03-31	1426294
2017-06-30	1533534
2017-09-30	1555857
2017-12-31	1521445
2018-03-31	1586563
2018-06-30	1546266
2018-09-30	1540487
2018-12-31	1513310
2019-03-31	1530412
2019-06-30	1569536
2019-09-30	1551454
2019-12-31	1479654
2020-03-31	1570905
2020-06-30	1561655
2020-09-30	1661154
2020-12-31	1694459
2021-03-31	1676369
2021-06-30	1655114
2021-09-30	1618090
2021-12-31	1626667
2022-03-31	1621412
2022-06-30	1503810
2022-09-30	1425401
2022-12-31	1467814
2023-03-31	1488112
2023-06-30	1470996
2023-09-30	1452897