Quarter	US dollars
1999-09-30	10
1999-12-31	6
2000-03-31	13
2000-06-30	15
2000-09-30	18
2000-12-31	22
2001-03-31	77
2001-06-30	105
2001-09-30	73
2001-12-31	55
2002-03-31	63
2002-06-30	96
2002-09-30	91
2002-12-31	90
2003-03-31	142
2003-06-30	112
2003-09-30	168
2003-12-31	159
2004-03-31	200
2004-06-30	256
2004-09-30	346
2004-12-31	140
2005-03-31	164
2005-06-30	210
2005-09-30	230
2005-12-31	1928
2006-03-31	404
2006-06-30	803
2006-09-30	858
2006-12-31	1033
2007-03-31	898
2007-06-30	885
2007-09-30	892
2007-12-31	836
2008-03-31	1791
2008-06-30	2211
2008-09-30	2413
2008-12-31	4796
2009-03-31	3607
2009-06-30	3175
2009-09-30	2266
2009-12-31	2164
2010-03-31	2753
2010-06-30	3558
2010-09-30	3991
2010-12-31	3547
2011-03-31	1675
2011-06-30	3311
2011-09-30	4091
2011-12-31	2506
2012-03-31	2415
2012-06-30	2783
2012-09-30	2897
2012-12-31	1363
2013-03-31	1772
2013-06-30	1033
2013-09-30	1347
2013-12-31	1344
2014-03-31	1456
2014-06-30	1558
2014-09-30	1623
2014-12-31	2054
2015-03-31	1933
2015-06-30	1903
2015-09-30	1851
2015-12-31	1654
2016-03-31	2349
2016-06-30	1896
2016-09-30	2484
2016-12-31	2977
2017-03-31	3259
2017-06-30	2829
2017-09-30	2432
2017-12-31	2857
2018-03-31	2866
2018-06-30	2658
2018-09-30	2649
2018-12-31	2840
2019-03-31	2368
2019-06-30	2518
2019-09-30	2636
2019-12-31	2530
2020-03-31	4833
2020-06-30	4490
2020-09-30	3430
2020-12-31	3307
2021-03-31	2630
2021-06-30	2483
2021-09-30	2210
2021-12-31	2167
2022-03-31	2080
2022-06-30	2426
2022-09-30	2715
2022-12-31	2809
2023-03-31	2383
2023-06-30	2565
2023-09-30	2294