Quarter	US dollars
1999-03-31	1370
1999-06-30	522
1999-09-30	432
1999-12-31	344
2000-03-31	451
2000-06-30	481
2000-09-30	417
2000-12-31	689
2001-03-31	538
2001-06-30	597
2001-09-30	694
2001-12-31	1130
2002-03-31	844
2002-06-30	983
2002-09-30	1446
2002-12-31	1194
2003-03-31	1374
2003-06-30	1134
2003-09-30	1163
2003-12-31	1078
2004-03-31	1222
2004-06-30	670
2004-09-30	497
2004-12-31	378
2005-03-31	430
2005-06-30	308
2005-09-30	389
2005-12-31	571
2006-03-31	574
2006-06-30	328
2006-09-30	211
2006-12-31	507
2007-03-31	1017
2007-06-30	578
2007-09-30	1121
2007-12-31	955
2008-03-31	1116
2008-06-30	918
2008-09-30	484
2008-12-31	179
2009-03-31	66
2009-06-30	167
2009-09-30	170
2009-12-31	246
2010-03-31	113
2010-06-30	188
2010-09-30	88
2010-12-31	64
2011-03-31	134
2011-06-30	174
2011-09-30	78
2011-12-31	78
2012-03-31	146
2012-06-30	119
2012-09-30	281
2012-12-31	476
2013-03-31	381
2013-06-30	824
2013-09-30	998
2013-12-31	1037
2014-03-31	1445
2014-06-30	1522
2014-09-30	825
2014-12-31	416
2015-03-31	350
2015-06-30	231
2015-09-30	1300
2015-12-31	1313
2016-03-31	1379
2016-06-30	1625
2016-09-30	1042
2016-12-31	1135
2017-03-31	1382
2017-06-30	1456
2017-09-30	1207
2017-12-31	1280
2018-03-31	1215
2018-06-30	848
2018-09-30	1032
2018-12-31	1178
2019-03-31	1687
2019-06-30	2548
2019-09-30	2901
2019-12-31	1770
2020-03-31	2876
2020-06-30	3295
2020-09-30	3552
2020-12-31	3562
2021-03-31	590
2021-06-30	618
2021-09-30	697
2021-12-31	653
2022-03-31	402
2022-06-30	822
2022-09-30	1145
2022-12-31	909
2023-03-31	570
2023-06-30	716
2023-09-30	686