Quarter	US dollars
1999-03-31	2604
1999-06-30	2224
1999-09-30	1857
1999-12-31	1242
2000-03-31	1511
2000-06-30	1403
2000-09-30	1366
2000-12-31	1375
2001-03-31	1093
2001-06-30	1150
2001-09-30	1624
2001-12-31	1743
2002-03-31	2489
2002-06-30	3401
2002-09-30	2641
2002-12-31	3170
2003-03-31	3316
2003-06-30	3570
2003-09-30	3770
2003-12-31	4052
2004-03-31	1558
2004-06-30	1208
2004-09-30	1407
2004-12-31	1988
2005-03-31	1891
2005-06-30	1874
2005-09-30	1679
2005-12-31	329
2006-03-31	648
2006-06-30	399
2006-09-30	300
2006-12-31	583
2007-03-31	809
2007-06-30	655
2007-09-30	625
2007-12-31	110
2008-03-31	28
2008-06-30	396
2008-09-30	323
2008-12-31	2387
2009-03-31	5523
2009-06-30	3411
2009-09-30	1535
2009-12-31	1227
2010-03-31	1781
2010-06-30	1036
2010-09-30	861
2010-12-31	1168
2011-03-31	1447
2011-06-30	1507
2011-09-30	1447
2011-12-31	3660
2012-03-31	5077
2012-06-30	4420
2012-09-30	4751
2012-12-31	5255
2013-03-31	5683
2013-06-30	6522
2013-09-30	8109
2013-12-31	7083
2014-03-31	68581
2014-06-30	68277
2014-09-30	69392
2014-12-31	68709
2015-03-31	72268
2015-06-30	78528
2015-09-30	79717
2015-12-31	75969
2016-03-31	77380
2016-06-30	73655
2016-09-30	71921
2016-12-31	63516
2017-03-31	62420
2017-06-30	61371
2017-09-30	57294
2017-12-31	53342
2018-03-31	56103
2018-06-30	50930
2018-09-30	58204
2018-12-31	55210
2019-03-31	67932
2019-06-30	71469
2019-09-30	71700
2019-12-31	68059
2020-03-31	72472
2020-06-30	72528
2020-09-30	76521
2020-12-31	75590
2021-03-31	76420
2021-06-30	82266
2021-09-30	79417
2021-12-31	73164
2022-03-31	77840
2022-06-30	74919
2022-09-30	70207
2022-12-31	73455
2023-03-31	77351
2023-06-30	81352
2023-09-30	84361