Quarter	US dollars
1999-03-31	1444
1999-06-30	1328
1999-09-30	1453
1999-12-31	1452
2000-03-31	1529
2000-06-30	1438
2000-09-30	1510
2000-12-31	1481
2001-03-31	1466
2001-06-30	1402
2001-09-30	1409
2001-12-31	1397
2002-03-31	1105
2002-06-30	1032
2002-09-30	932
2002-12-31	986
2003-03-31	942
2003-06-30	866
2003-09-30	897
2003-12-31	837
2004-03-31	952
2004-06-30	962
2004-09-30	991
2004-12-31	1008
2005-03-31	1293
2005-06-30	1722
2005-09-30	1714
2005-12-31	1718
2006-03-31	1414
2006-06-30	1429
2006-09-30	1432
2006-12-31	1559
2007-03-31	1597
2007-06-30	1678
2007-09-30	1752
2007-12-31	1721
2008-03-31	1855
2008-06-30	1861
2008-09-30	1830
2008-12-31	1804
2009-03-31	1833
2009-06-30	1838
2009-09-30	1764
2009-12-31	1760
2010-03-31	1843
2010-06-30	1837
2010-09-30	1866
2010-12-31	1800
2011-03-31	1730
2011-06-30	1774
2011-09-30	1807
2011-12-31	1935
2012-03-31	2004
2012-06-30	1983
2012-09-30	2074
2012-12-31	1940
2013-03-31	1988
2013-06-30	1848
2013-09-30	1748
2013-12-31	1725
2014-03-31	1736
2014-06-30	1457
2014-09-30	1484
2014-12-31	1408
2015-03-31	1429
2015-06-30	1364
2015-09-30	1329
2015-12-31	1386
2016-03-31	1646
2016-06-30	2589
2016-09-30	2632
2016-12-31	2570
2017-03-31	2489
2017-06-30	2818
2017-09-30	3786
2017-12-31	3891
2018-03-31	4086
2018-06-30	3758
2018-09-30	3898
2018-12-31	4060
2019-03-31	4178
2019-06-30	4445
2019-09-30	4623
2019-12-31	4457
2020-03-31	4365
2020-06-30	4195
2020-09-30	4282
2020-12-31	4146
2021-03-31	3990
2021-06-30	4074
2021-09-30	3995
2021-12-31	3812
2022-03-31	3686
2022-06-30	3260
2022-09-30	3271
2022-12-31	3045
2023-03-31	3005
2023-06-30	2775
2023-09-30	2718