Quarter	US dollars
1999-03-31	582
1999-06-30	757
1999-09-30	615
1999-12-31	449
2000-03-31	418
2000-06-30	387
2000-09-30	650
2000-12-31	416
2001-03-31	438
2001-06-30	402
2001-09-30	619
2001-12-31	752
2002-03-31	944
2002-06-30	861
2002-09-30	1942
2002-12-31	1048
2003-03-31	1800
2003-06-30	1860
2003-09-30	1315
2003-12-31	2363
2004-03-31	2887
2004-06-30	3972
2004-09-30	4945
2004-12-31	1959
2005-03-31	3857
2005-06-30	5571
2005-09-30	3762
2005-12-31	2268
2006-03-31	1354
2006-06-30	3037
2006-09-30	1617
2006-12-31	1906
2007-03-31	2354
2007-06-30	3466
2007-09-30	5599
2007-12-31	3641
2008-03-31	4434
2008-06-30	3011
2008-09-30	2282
2008-12-31	4790
2009-03-31	3455
2009-06-30	3433
2009-09-30	4110
2009-12-31	3894
2010-03-31	2942
2010-06-30	3530
2010-09-30	4369
2010-12-31	2093
2011-03-31	2222
2011-06-30	1745
2011-09-30	2379
2011-12-31	1914
2012-03-31	3449
2012-06-30	2960
2012-09-30	2503
2012-12-31	2158
2013-03-31	2185
2013-06-30	2295
2013-09-30	2093
2013-12-31	1672
2014-03-31	3315
2014-06-30	3961
2014-09-30	2266
2014-12-31	1870
2015-03-31	1795
2015-06-30	3468
2015-09-30	2475
2015-12-31	1477
2016-03-31	1811
2016-06-30	2218
2016-09-30	2123
2016-12-31	2442
2017-03-31	2757
2017-06-30	2626
2017-09-30	2707
2017-12-31	2709
2018-03-31	3377
2018-06-30	2753
2018-09-30	3095
2018-12-31	2160
2019-03-31	2453
2019-06-30	2588
2019-09-30	1804
2019-12-31	1697
2020-03-31	2207
2020-06-30	5462
2020-09-30	3593
2020-12-31	2132
2021-03-31	2542
2021-06-30	2443
2021-09-30	2975
2021-12-31	2330
2022-03-31	2878
2022-06-30	3391
2022-09-30	3194
2022-12-31	3577
2023-03-31	3202
2023-06-30	2470
2023-09-30	2889