Quarter	US dollars
1999-09-30	2261
1999-12-31	2197
2000-03-31	2378
2000-06-30	2501
2000-09-30	2418
2000-12-31	3362
2001-03-31	2879
2001-06-30	2570
2001-09-30	2405
2001-12-31	3092
2002-03-31	3163
2002-06-30	3229
2002-09-30	3397
2002-12-31	3649
2003-03-31	3637
2003-06-30	3812
2003-09-30	4238
2003-12-31	4732
2004-03-31	5299
2004-06-30	5719
2004-09-30	6327
2004-12-31	6869
2005-03-31	7796
2005-06-30	8543
2005-09-30	9382
2005-12-31	9761
2006-03-31	10535
2006-06-30	11873
2006-09-30	11981
2006-12-31	12932
2007-03-31	13317
2007-06-30	15094
2007-09-30	16358
2007-12-31	18685
2008-03-31	19344
2008-06-30	20098
2008-09-30	19742
2008-12-31	17444
2009-03-31	16688
2009-06-30	16537
2009-09-30	16997
2009-12-31	17009
2010-03-31	18487
2010-06-30	21701
2010-09-30	23223
2010-12-31	24729
2011-03-31	28598
2011-06-30	29002
2011-09-30	26165
2011-12-31	28495
2012-03-31	29878
2012-06-30	34057
2012-09-30	34636
2012-12-31	36150
2013-03-31	36161
2013-06-30	36957
2013-09-30	34003
2013-12-31	35021
2014-03-31	32432
2014-06-30	34042
2014-09-30	31252
2014-12-31	31803
2015-03-31	29446
2015-06-30	26859
2015-09-30	25364
2015-12-31	23903
2016-03-31	24108
2016-06-30	22076
2016-09-30	23450
2016-12-31	18430
2017-03-31	18558
2017-06-30	21367
2017-09-30	19353
2017-12-31	18794
2018-03-31	19232
2018-06-30	17573
2018-09-30	16363
2018-12-31	15004
2019-03-31	15319
2019-06-30	15863
2019-09-30	14527
2019-12-31	13285
2020-03-31	12144
2020-06-30	11844
2020-09-30	13472
2020-12-31	14390
2021-03-31	14140
2021-06-30	13576
2021-09-30	12656
2021-12-31	11158
2022-03-31	11232
2022-06-30	11250
2022-09-30	9996
2022-12-31	11172
2023-03-31	12056
2023-06-30	11736
2023-09-30	11373