Quarter	US dollars
1999-03-31	537
1999-06-30	491
1999-09-30	577
1999-12-31	722
2000-03-31	1164
2000-06-30	941
2000-09-30	890
2000-12-31	889
2001-03-31	1665
2001-06-30	1035
2001-09-30	1130
2001-12-31	859
2002-03-31	920
2002-06-30	1061
2002-09-30	1063
2002-12-31	733
2003-03-31	605
2003-06-30	618
2003-09-30	872
2003-12-31	921
2004-03-31	1004
2004-06-30	967
2004-09-30	981
2004-12-31	1116
2005-03-31	1109
2005-06-30	1137
2005-09-30	1295
2005-12-31	1365
2006-03-31	1383
2006-06-30	1406
2006-09-30	1122
2006-12-31	895
2007-03-31	921
2007-06-30	1176
2007-09-30	1316
2007-12-31	1268
2008-03-31	1394
2008-06-30	1325
2008-09-30	1317
2008-12-31	1045
2009-03-31	942
2009-06-30	1080
2009-09-30	1171
2009-12-31	1211
2010-03-31	1337
2010-06-30	1698
2010-09-30	2171
2010-12-31	1854
2011-03-31	2180
2011-06-30	1776
2011-09-30	1341
2011-12-31	1181
2012-03-31	1458
2012-06-30	1492
2012-09-30	1304
2012-12-31	1245
2013-03-31	1570
2013-06-30	1502
2013-09-30	1275
2013-12-31	1370
2014-03-31	1323
2014-06-30	1538
2014-09-30	1466
2014-12-31	1483
2015-03-31	2105
2015-06-30	1908
2015-09-30	1815
2015-12-31	1663
2016-03-31	1771
2016-06-30	1862
2016-09-30	2026
2016-12-31	1481
2017-03-31	1447
2017-06-30	2261
2017-09-30	1527
2017-12-31	1580
2018-03-31	1742
2018-06-30	1763
2018-09-30	1808
2018-12-31	1801
2019-03-31	1861
2019-06-30	1808
2019-09-30	1876
2019-12-31	1972
2020-03-31	3790
2020-06-30	2205
2020-09-30	2138
2020-12-31	2247
2021-03-31	2205
2021-06-30	2362
2021-09-30	2137
2021-12-31	2351
2022-03-31	2398
2022-06-30	2404
2022-09-30	2289
2022-12-31	1872
2023-03-31	2151
2023-06-30	1746
2023-09-30	1913