Quarter	US dollars
1999-09-30	2006
1999-12-31	2328
2000-03-31	2305
2000-06-30	2854
2000-09-30	2931
2000-12-31	3154
2001-03-31	2168
2001-06-30	2242
2001-09-30	2571
2001-12-31	2288
2002-03-31	2787
2002-06-30	3288
2002-09-30	3430
2002-12-31	3198
2003-03-31	3066
2003-06-30	3188
2003-09-30	2836
2003-12-31	4158
2004-03-31	4722
2004-06-30	2545
2004-09-30	3923
2004-12-31	3677
2005-03-31	3191
2005-06-30	2744
2005-09-30	4134
2005-12-31	3007
2006-03-31	3304
2006-06-30	3283
2006-09-30	3041
2006-12-31	3652
2007-03-31	4976
2007-06-30	4524
2007-09-30	5823
2007-12-31	9431
2008-03-31	11080
2008-06-30	7962
2008-09-30	8991
2008-12-31	6787
2009-03-31	6779
2009-06-30	7964
2009-09-30	6891
2009-12-31	7008
2010-03-31	9601
2010-06-30	9933
2010-09-30	12007
2010-12-31	14226
2011-03-31	13928
2011-06-30	11970
2011-09-30	13583
2011-12-31	10908
2012-03-31	10126
2012-06-30	10593
2012-09-30	9754
2012-12-31	9701
2013-03-31	8237
2013-06-30	7452
2013-09-30	10029
2013-12-31	10333
2014-03-31	12501
2014-06-30	11258
2014-09-30	12893
2014-12-31	12081
2015-03-31	12771
2015-06-30	13250
2015-09-30	12925
2015-12-31	12652
2016-03-31	16740
2016-06-30	18779
2016-09-30	22358
2016-12-31	20118
2017-03-31	18543
2017-06-30	20918
2017-09-30	20899
2017-12-31	21796
2018-03-31	22696
2018-06-30	21637
2018-09-30	19353
2018-12-31	20222
2019-03-31	19925
2019-06-30	18611
2019-09-30	17164
2019-12-31	18723
2020-03-31	19618
2020-06-30	18560
2020-09-30	15604
2020-12-31	18918
2021-03-31	16441
2021-06-30	17354
2021-09-30	16634
2021-12-31	15973
2022-03-31	16724
2022-06-30	19462
2022-09-30	17676
2022-12-31	19537
2023-03-31	17347
2023-06-30	19222
2023-09-30	19273