Quarter	US dollars
1997-09-30	26079
1997-12-31	33981
1998-03-31	33619
1998-06-30	31632
1998-09-30	33055
1998-12-31	36928
1999-03-31	40007
1999-06-30	39630
1999-09-30	42996
1999-12-31	41253
2000-03-31	41913
2000-06-30	38861
2000-09-30	39888
2000-12-31	42078
2001-03-31	40426
2001-06-30	39690
2001-09-30	40255
2001-12-31	39928
2002-03-31	37823
2002-06-30	34974
2002-09-30	36628
2002-12-31	36370
2003-03-31	34071
2003-06-30	33259
2003-09-30	33186
2003-12-31	32441
2004-03-31	37270
2004-06-30	34533
2004-09-30	36317
2004-12-31	38339
2005-03-31	37126
2005-06-30	45907
2005-09-30	47066
2005-12-31	52991
2006-03-31	57645
2006-06-30	65521
2006-09-30	58565
2006-12-31	60958
2007-03-31	68911
2007-06-30	66134
2007-09-30	82411
2007-12-31	80004
2008-03-31	93364
2008-06-30	95068
2008-09-30	95308
2008-12-31	87964
2009-03-31	89623
2009-06-30	92135
2009-09-30	91253
2009-12-31	87334
2010-03-31	82076
2010-06-30	81612
2010-09-30	92534
2010-12-31	90238
2011-03-31	90622
2011-06-30	91752
2011-09-30	87281
2011-12-31	79583
2012-03-31	84559
2012-06-30	83254
2012-09-30	82836
2012-12-31	79817
2013-03-31	75508
2013-06-30	61124
2013-09-30	61311
2013-12-31	61361
2014-03-31	61768
2014-06-30	59629
2014-09-30	59424
2014-12-31	57484
2015-03-31	49515
2015-06-30	47801
2015-09-30	42197
2015-12-31	39442
2016-03-31	38380
2016-06-30	41741
2016-09-30	42927
2016-12-31	42324
2017-03-31	42657
2017-06-30	53180
2017-09-30	53879
2017-12-31	58120
2018-03-31	58972
2018-06-30	57649
2018-09-30	59922
2018-12-31	54730
2019-03-31	54440
2019-06-30	58327
2019-09-30	59774
2019-12-31	64935
2020-03-31	65746
2020-06-30	57265
2020-09-30	54197
2020-12-31	53943
2021-03-31	51173
2021-06-30	54858
2021-09-30	54527
2021-12-31	55171
2022-03-31	55311
2022-06-30	59040
2022-09-30	62846
2022-12-31	43470
2023-03-31	36603
2023-06-30	50984
2023-09-30	51499