Quarter	US dollars
1999-03-31	482
1999-06-30	509
1999-09-30	541
1999-12-31	528
2000-03-31	567
2000-06-30	661
2000-09-30	670
2000-12-31	936
2001-03-31	853
2001-06-30	807
2001-09-30	941
2001-12-31	699
2002-03-31	727
2002-06-30	701
2002-09-30	667
2002-12-31	563
2003-03-31	517
2003-06-30	436
2003-09-30	456
2003-12-31	579
2004-03-31	451
2004-06-30	584
2004-09-30	578
2004-12-31	1444
2005-03-31	1439
2005-06-30	1648
2005-09-30	1775
2005-12-31	1413
2006-03-31	840
2006-06-30	1013
2006-09-30	1686
2006-12-31	1747
2007-03-31	1430
2007-06-30	1289
2007-09-30	898
2007-12-31	939
2008-03-31	903
2008-06-30	1049
2008-09-30	1323
2008-12-31	937
2009-03-31	941
2009-06-30	989
2009-09-30	1014
2009-12-31	2104
2010-03-31	1127
2010-06-30	1522
2010-09-30	2667
2010-12-31	4505
2011-03-31	4936
2011-06-30	6015
2011-09-30	4463
2011-12-31	3585
2012-03-31	4063
2012-06-30	3268
2012-09-30	2308
2012-12-31	2493
2013-03-31	3204
2013-06-30	2247
2013-09-30	4359
2013-12-31	3988
2014-03-31	3968
2014-06-30	4314
2014-09-30	4681
2014-12-31	4695
2015-03-31	4403
2015-06-30	5129
2015-09-30	5894
2015-12-31	5972
2016-03-31	5192
2016-06-30	4416
2016-09-30	4196
2016-12-31	4033
2017-03-31	4044
2017-06-30	3676
2017-09-30	2315
2017-12-31	1976
2018-03-31	1580
2018-06-30	2543
2018-09-30	2042
2018-12-31	1476
2019-03-31	1729
2019-06-30	2149
2019-09-30	2793
2019-12-31	2160
2020-03-31	3068
2020-06-30	3025
2020-09-30	2995
2020-12-31	2733
2021-03-31	3452
2021-06-30	3241
2021-09-30	3610
2021-12-31	3192
2022-03-31	3836
2022-06-30	3566
2022-09-30	3849
2022-12-31	3722
2023-03-31	3407
2023-06-30	3133
2023-09-30	3077