Quarter	US dollars
1999-09-30	6549
1999-12-31	5501
2000-03-31	4299
2000-06-30	5363
2000-09-30	5791
2000-12-31	8182
2001-03-31	10077
2001-06-30	7888
2001-09-30	7519
2001-12-31	11217
2002-03-31	7044
2002-06-30	11901
2002-09-30	7901
2002-12-31	8917
2003-03-31	7484
2003-06-30	8302
2003-09-30	14208
2003-12-31	8652
2004-03-31	7741
2004-06-30	6576
2004-09-30	6671
2004-12-31	7970
2005-03-31	7446
2005-06-30	8660
2005-09-30	7866
2005-12-31	7599
2006-03-31	10043
2006-06-30	13902
2006-09-30	10260
2006-12-31	7165
2007-03-31	10758
2007-06-30	16495
2007-09-30	15778
2007-12-31	19246
2008-03-31	32178
2008-06-30	23690
2008-09-30	22503
2008-12-31	60011
2009-03-31	32361
2009-06-30	28332
2009-09-30	31837
2009-12-31	30994
2010-03-31	28465
2010-06-30	31395
2010-09-30	39085
2010-12-31	32292
2011-03-31	34985
2011-06-30	36434
2011-09-30	40776
2011-12-31	33227
2012-03-31	31778
2012-06-30	27220
2012-09-30	24999
2012-12-31	33237
2013-03-31	29422
2013-06-30	25611
2013-09-30	22042
2013-12-31	26519
2014-03-31	21613
2014-06-30	20080
2014-09-30	25626
2014-12-31	27369
2015-03-31	19720
2015-06-30	19350
2015-09-30	23031
2015-12-31	19819
2016-03-31	23387
2016-06-30	25032
2016-09-30	22083
2016-12-31	28890
2017-03-31	16862
2017-06-30	20509
2017-09-30	19335
2017-12-31	16912
2018-03-31	14354
2018-06-30	9478
2018-09-30	17369
2018-12-31	13669
2019-03-31	13636
2019-06-30	14418
2019-09-30	15970
2019-12-31	12620
2020-03-31	16061
2020-06-30	15509
2020-09-30	14396
2020-12-31	15965
2021-03-31	21231
2021-06-30	13126
2021-09-30	12002
2021-12-31	12891
2022-03-31	20412
2022-06-30	22453
2022-09-30	23124
2022-12-31	14415
2023-03-31	12274
2023-06-30	20314
2023-09-30	18060