Quarter	US dollars
1999-03-31	1454
1999-06-30	1314
1999-09-30	1252
1999-12-31	1304
2000-03-31	1521
2000-06-30	1406
2000-09-30	1334
2000-12-31	1244
2001-03-31	1216
2001-06-30	1080
2001-09-30	1126
2001-12-31	1033
2002-03-31	1502
2002-06-30	1353
2002-09-30	1248
2002-12-31	1314
2003-03-31	1414
2003-06-30	1397
2003-09-30	1549
2003-12-31	1869
2004-03-31	2196
2004-06-30	2458
2004-09-30	2705
2004-12-31	2998
2005-03-31	3387
2005-06-30	3507
2005-09-30	3600
2005-12-31	3946
2006-03-31	3903
2006-06-30	3840
2006-09-30	3645
2006-12-31	3244
2007-03-31	2829
2007-06-30	2425
2007-09-30	2607
2007-12-31	2670
2008-03-31	2750
2008-06-30	2016
2008-09-30	1643
2008-12-31	1347
2009-03-31	1108
2009-06-30	960
2009-09-30	888
2009-12-31	1025
2010-03-31	1070
2010-06-30	1070
2010-09-30	722
2010-12-31	629
2011-03-31	646
2011-06-30	493
2011-09-30	491
2011-12-31	426
2012-03-31	280
2012-06-30	266
2012-09-30	243
2012-12-31	220
2013-03-31	228
2013-06-30	73
2013-09-30	67
2013-12-31	62
2014-03-31	61
2014-06-30	44
2014-09-30	41
2014-12-31	24
2015-03-31	21
2015-06-30	18
2015-09-30	13
2015-12-31	11
2016-03-31	12
2016-06-30	8
2016-09-30	7
2016-12-31	4
2017-03-31	3
2017-06-30	3
2017-09-30	3
2017-12-31	3
2018-03-31	4
2018-06-30	4
2018-09-30	3
2018-12-31	3
2019-03-31	3
2019-06-30	3
2019-09-30	3
2019-12-31	3
2020-03-31	3
2020-06-30	3
2020-09-30	4
2020-12-31	4
2021-03-31	4
2021-06-30	4
2021-09-30	3
2021-12-31	3
2022-03-31	3
2022-06-30	3
2022-09-30	3
2022-12-31	3
2023-03-31	3
2023-06-30	3
2023-09-30	3