Quarter	US dollars
1999-03-31	3652
1999-06-30	3352
1999-09-30	3425
1999-12-31	4430
2000-03-31	4829
2000-06-30	2265
2000-09-30	2061
2000-12-31	3209
2001-03-31	4793
2001-06-30	5590
2001-09-30	5748
2001-12-31	3936
2002-03-31	4340
2002-06-30	4610
2002-09-30	5550
2002-12-31	6164
2003-03-31	6810
2003-06-30	7054
2003-09-30	8409
2003-12-31	8224
2004-03-31	9873
2004-06-30	8906
2004-09-30	9489
2004-12-31	10812
2005-03-31	9188
2005-06-30	10591
2005-09-30	8643
2005-12-31	11327
2006-03-31	11157
2006-06-30	13645
2006-09-30	12601
2006-12-31	13116
2007-03-31	13041
2007-06-30	16937
2007-09-30	19496
2007-12-31	12470
2008-03-31	14835
2008-06-30	17481
2008-09-30	15957
2008-12-31	8901
2009-03-31	9488
2009-06-30	9340
2009-09-30	11963
2009-12-31	17173
2010-03-31	17164
2010-06-30	17006
2010-09-30	18835
2010-12-31	16984
2011-03-31	18762
2011-06-30	23031
2011-09-30	22880
2011-12-31	21250
2012-03-31	25490
2012-06-30	27890
2012-09-30	27849
2012-12-31	29258
2013-03-31	27581
2013-06-30	28432
2013-09-30	18378
2013-12-31	16343
2014-03-31	17380
2014-06-30	17661
2014-09-30	17324
2014-12-31	16842
2015-03-31	13232
2015-06-30	14224
2015-09-30	8772
2015-12-31	9266
2016-03-31	7024
2016-06-30	6871
2016-09-30	7113
2016-12-31	5551
2017-03-31	5501
2017-06-30	4786
2017-09-30	3559
2017-12-31	3499
2018-03-31	3049
2018-06-30	3400
2018-09-30	2451
2018-12-31	2577
2019-03-31	1268
2019-06-30	1326
2019-09-30	1133
2019-12-31	1255
2020-03-31	1489
2020-06-30	1579
2020-09-30	1622
2020-12-31	715
2021-03-31	965
2021-06-30	891
2021-09-30	785
2021-12-31	381
2022-03-31	479
2022-06-30	451
2022-09-30	348
2022-12-31	303
2023-03-31	438
2023-06-30	485
2023-09-30	469