Quarter	US dollars
1999-03-31	41
1999-06-30	53
1999-09-30	92
1999-12-31	88
2000-03-31	56
2000-06-30	111
2000-09-30	211
2000-12-31	200
2001-03-31	266
2001-06-30	266
2001-09-30	374
2001-12-31	372
2002-03-31	348
2002-06-30	345
2002-09-30	396
2002-12-31	484
2003-03-31	443
2003-06-30	240
2003-09-30	382
2003-12-31	399
2004-03-31	400
2004-06-30	458
2004-09-30	634
2004-12-31	527
2005-03-31	517
2005-06-30	601
2005-09-30	608
2005-12-31	595
2006-03-31	621
2006-06-30	970
2006-09-30	946
2006-12-31	886
2007-03-31	805
2007-06-30	841
2007-09-30	1233
2007-12-31	1696
2008-03-31	1341
2008-06-30	1808
2008-09-30	1980
2008-12-31	2353
2009-03-31	2288
2009-06-30	2440
2009-09-30	1617
2009-12-31	1333
2010-03-31	1338
2010-06-30	1224
2010-09-30	1436
2010-12-31	948
2011-03-31	812
2011-06-30	950
2011-09-30	1342
2011-12-31	1395
2012-03-31	1167
2012-06-30	1085
2012-09-30	1203
2012-12-31	1188
2013-03-31	1220
2013-06-30	1127
2013-09-30	1074
2013-12-31	1210
2014-03-31	1283
2014-06-30	1409
2014-09-30	1215
2014-12-31	1267
2015-03-31	1412
2015-06-30	1295
2015-09-30	1159
2015-12-31	1071
2016-03-31	1038
2016-06-30	1118
2016-09-30	1137
2016-12-31	792
2017-03-31	663
2017-06-30	655
2017-09-30	483
2017-12-31	568
2018-03-31	549
2018-06-30	557
2018-09-30	520
2018-12-31	505
2019-03-31	348
2019-06-30	334
2019-09-30	230
2019-12-31	411
2020-03-31	333
2020-06-30	376
2020-09-30	393
2020-12-31	251
2021-03-31	245
2021-06-30	229
2021-09-30	228
2021-12-31	210
2022-03-31	313
2022-06-30	311
2022-09-30	296
2022-12-31	291
2023-03-31	295
2023-06-30	358
2023-09-30	244