Quarter	US dollars
1999-09-30	10284
1999-12-31	6887
2000-03-31	7907
2000-06-30	8759
2000-09-30	7417
2000-12-31	8051
2001-03-31	8176
2001-06-30	7400
2001-09-30	8535
2001-12-31	9455
2002-03-31	10916
2002-06-30	12498
2002-09-30	13570
2002-12-31	14709
2003-03-31	16171
2003-06-30	17814
2003-09-30	16639
2003-12-31	19326
2004-03-31	19097
2004-06-30	20280
2004-09-30	21683
2004-12-31	21976
2005-03-31	21971
2005-06-30	20954
2005-09-30	20911
2005-12-31	20867
2006-03-31	22333
2006-06-30	21178
2006-09-30	20125
2006-12-31	20187
2007-03-31	19607
2007-06-30	20798
2007-09-30	18618
2007-12-31	14518
2008-03-31	12837
2008-06-30	10156
2008-09-30	6970
2008-12-31	5957
2009-03-31	7416
2009-06-30	7029
2009-09-30	6910
2009-12-31	6952
2010-03-31	7642
2010-06-30	6037
2010-09-30	6541
2010-12-31	6784
2011-03-31	8011
2011-06-30	7117
2011-09-30	7075
2011-12-31	7090
2012-03-31	7369
2012-06-30	6446
2012-09-30	6472
2012-12-31	6850
2013-03-31	6497
2013-06-30	6462
2013-09-30	11346
2013-12-31	11498
2014-03-31	12463
2014-06-30	11253
2014-09-30	10584
2014-12-31	10135
2015-03-31	9613
2015-06-30	9072
2015-09-30	11191
2015-12-31	10782
2016-03-31	11107
2016-06-30	12817
2016-09-30	11462
2016-12-31	11373
2017-03-31	10058
2017-06-30	10600
2017-09-30	11185
2017-12-31	12382
2018-03-31	10865
2018-06-30	9356
2018-09-30	8935
2018-12-31	9116
2019-03-31	7486
2019-06-30	7044
2019-09-30	6871
2019-12-31	10446
2020-03-31	6447
2020-06-30	16466
2020-09-30	17263
2020-12-31	20360
2021-03-31	18985
2021-06-30	15372
2021-09-30	15457
2021-12-31	19099
2022-03-31	15237
2022-06-30	12426
2022-09-30	9233
2022-12-31	15996
2023-03-31	12762
2023-06-30	7007
2023-09-30	6907
2023-12-31	8981