Quarter	US dollars
1999-03-31	1455
1999-06-30	1563
1999-09-30	1683
1999-12-31	1795
2000-03-31	1746
2000-06-30	1861
2000-09-30	1916
2000-12-31	1746
2001-03-31	1637
2001-06-30	1631
2001-09-30	1555
2001-12-31	1511
2002-03-31	1343
2002-06-30	1306
2002-09-30	1423
2002-12-31	1500
2003-03-31	1304
2003-06-30	1345
2003-09-30	1412
2003-12-31	1376
2004-03-31	1510
2004-06-30	1467
2004-09-30	1413
2004-12-31	1571
2005-03-31	1421
2005-06-30	1448
2005-09-30	1444
2005-12-31	1208
2006-03-31	1252
2006-06-30	1449
2006-09-30	1586
2006-12-31	1653
2007-03-31	1619
2007-06-30	2081
2007-09-30	2408
2007-12-31	2420
2008-03-31	2317
2008-06-30	2541
2008-09-30	2291
2008-12-31	2388
2009-03-31	2454
2009-06-30	2567
2009-09-30	2642
2009-12-31	2690
2010-03-31	2954
2010-06-30	3165
2010-09-30	3238
2010-12-31	3475
2011-03-31	3646
2011-06-30	3255
2011-09-30	2804
2011-12-31	2557
2012-03-31	2592
2012-06-30	2346
2012-09-30	2273
2012-12-31	2255
2013-03-31	2478
2013-06-30	2501
2013-09-30	2645
2013-12-31	3173
2014-03-31	2948
2014-06-30	2935
2014-09-30	3050
2014-12-31	2806
2015-03-31	2623
2015-06-30	3048
2015-09-30	3211
2015-12-31	2987
2016-03-31	2548
2016-06-30	2438
2016-09-30	2306
2016-12-31	1887
2017-03-31	1893
2017-06-30	1838
2017-09-30	1794
2017-12-31	1752
2018-03-31	1714
2018-06-30	1720
2018-09-30	1626
2018-12-31	1632
2019-03-31	1661
2019-06-30	1649
2019-09-30	1665
2019-12-31	1760
2020-03-31	1740
2020-06-30	1856
2020-09-30	1917
2020-12-31	2128
2021-03-31	1664
2021-06-30	1847
2021-09-30	1697
2021-12-31	1550
2022-03-31	1416
2022-06-30	1514
2022-09-30	1525
2022-12-31	1511
2023-03-31	1727
2023-06-30	1459
2023-09-30	1426