Quarter	US dollars
1999-03-31	2666
1999-06-30	2760
1999-09-30	2788
1999-12-31	2812
2000-03-31	2853
2000-06-30	2872
2000-09-30	2836
2000-12-31	2852
2001-03-31	3010
2001-06-30	3146
2001-09-30	3226
2001-12-31	1851
2002-03-31	843
2002-06-30	761
2002-09-30	861
2002-12-31	443
2003-03-31	435
2003-06-30	358
2003-09-30	388
2003-12-31	436
2004-03-31	572
2004-06-30	422
2004-09-30	476
2004-12-31	463
2005-03-31	342
2005-06-30	803
2005-09-30	899
2005-12-31	296
2006-03-31	332
2006-06-30	292
2006-09-30	444
2006-12-31	531
2007-03-31	364
2007-06-30	357
2007-09-30	333
2007-12-31	588
2008-03-31	453
2008-06-30	513
2008-09-30	379
2008-12-31	479
2009-03-31	431
2009-06-30	567
2009-09-30	505
2009-12-31	477
2010-03-31	564
2010-06-30	604
2010-09-30	558
2010-12-31	498
2011-03-31	603
2011-06-30	565
2011-09-30	763
2011-12-31	997
2012-03-31	880
2012-06-30	859
2012-09-30	1003
2012-12-31	1071
2013-03-31	1703
2013-06-30	1744
2013-09-30	1723
2013-12-31	575
2014-03-31	920
2014-06-30	1026
2014-09-30	1017
2014-12-31	356
2015-03-31	467
2015-06-30	446
2015-09-30	630
2015-12-31	536
2016-03-31	715
2016-06-30	793
2016-09-30	878
2016-12-31	734
2017-03-31	655
2017-06-30	635
2017-09-30	768
2017-12-31	583
2018-03-31	674
2018-06-30	908
2018-09-30	808
2018-12-31	790
2019-03-31	852
2019-06-30	900
2019-09-30	887
2019-12-31	688
2020-03-31	639
2020-06-30	774
2020-09-30	870
2020-12-31	776
2021-03-31	691
2021-06-30	749
2021-09-30	1059
2021-12-31	953
2022-03-31	893
2022-06-30	713
2022-09-30	774
2022-12-31	556
2023-03-31	573
2023-06-30	440
2023-09-30	493