Quarter	US dollars
1999-03-31	234
1999-06-30	342
1999-09-30	335
1999-12-31	416
2000-03-31	427
2000-06-30	452
2000-09-30	305
2000-12-31	331
2001-03-31	618
2001-06-30	1211
2001-09-30	1261
2001-12-31	1358
2002-03-31	1341
2002-06-30	1634
2002-09-30	1416
2002-12-31	961
2003-03-31	1225
2003-06-30	1293
2003-09-30	1251
2003-12-31	922
2004-03-31	863
2004-06-30	954
2004-09-30	1311
2004-12-31	815
2005-03-31	1294
2005-06-30	1393
2005-09-30	1894
2005-12-31	2400
2006-03-31	2229
2006-06-30	2586
2006-09-30	2191
2006-12-31	2901
2007-03-31	2760
2007-06-30	3714
2007-09-30	3512
2007-12-31	5151
2008-03-31	4643
2008-06-30	7317
2008-09-30	7893
2008-12-31	3215
2009-03-31	4246
2009-06-30	2308
2009-09-30	2561
2009-12-31	2388
2010-03-31	3304
2010-06-30	3761
2010-09-30	4917
2010-12-31	4298
2011-03-31	4602
2011-06-30	4416
2011-09-30	2343
2011-12-31	2070
2012-03-31	1801
2012-06-30	1967
2012-09-30	2227
2012-12-31	2858
2013-03-31	1877
2013-06-30	2124
2013-09-30	1640
2013-12-31	1588
2014-03-31	1956
2014-06-30	1720
2014-09-30	2137
2014-12-31	7230
2015-03-31	2533
2015-06-30	1872
2015-09-30	1998
2015-12-31	1944
2016-03-31	1859
2016-06-30	1965
2016-09-30	1842
2016-12-31	2527
2017-03-31	1815
2017-06-30	1917
2017-09-30	1943
2017-12-31	2816
2018-03-31	2931
2018-06-30	2821
2018-09-30	1999
2018-12-31	2809
2019-03-31	2810
2019-06-30	2976
2019-09-30	2836
2019-12-31	1750
2020-03-31	1627
2020-06-30	1867
2020-09-30	1665
2020-12-31	1697
2021-03-31	1442
2021-06-30	1664
2021-09-30	1422
2021-12-31	1440
2022-03-31	1255
2022-06-30	1381
2022-09-30	1225
2022-12-31	1235
2023-03-31	1170
2023-06-30	1628
2023-09-30	1608