Quarter	US dollars
1999-03-31	2071
1999-06-30	2352
1999-09-30	2419
1999-12-31	2777
2000-03-31	2613
2000-06-30	2876
2000-09-30	3222
2000-12-31	5601
2001-03-31	5625
2001-06-30	5180
2001-09-30	5730
2001-12-31	5517
2002-03-31	5282
2002-06-30	5911
2002-09-30	7106
2002-12-31	7123
2003-03-31	6528
2003-06-30	7899
2003-09-30	8422
2003-12-31	9405
2004-03-31	10244
2004-06-30	11968
2004-09-30	9384
2004-12-31	12571
2005-03-31	11783
2005-06-30	12614
2005-09-30	10749
2005-12-31	9754
2006-03-31	10096
2006-06-30	11252
2006-09-30	11818
2006-12-31	13279
2007-03-31	14249
2007-06-30	16517
2007-09-30	17717
2007-12-31	16170
2008-03-31	12875
2008-06-30	14094
2008-09-30	11179
2008-12-31	9235
2009-03-31	9073
2009-06-30	10971
2009-09-30	10141
2009-12-31	9754
2010-03-31	8953
2010-06-30	8860
2010-09-30	10377
2010-12-31	10522
2011-03-31	10732
2011-06-30	11827
2011-09-30	11683
2011-12-31	11965
2012-03-31	12676
2012-06-30	12760
2012-09-30	13005
2012-12-31	12677
2013-03-31	12472
2013-06-30	11524
2013-09-30	10783
2013-12-31	7808
2014-03-31	7767
2014-06-30	7625
2014-09-30	6735
2014-12-31	6395
2015-03-31	5350
2015-06-30	6772
2015-09-30	5884
2015-12-31	5370
2016-03-31	5111
2016-06-30	5084
2016-09-30	5144
2016-12-31	4461
2017-03-31	4413
2017-06-30	4170
2017-09-30	4313
2017-12-31	4731
2018-03-31	4403
2018-06-30	4460
2018-09-30	4737
2018-12-31	4281
2019-03-31	4885
2019-06-30	4351
2019-09-30	4264
2019-12-31	4221
2020-03-31	5223
2020-06-30	4681
2020-09-30	4497
2020-12-31	5315
2021-03-31	4975
2021-06-30	5129
2021-09-30	5415
2021-12-31	4804
2022-03-31	4552
2022-06-30	4461
2022-09-30	4228
2022-12-31	3607
2023-03-31	3726
2023-06-30	4011
2023-09-30	3532