Quarter	US dollars
1999-03-31	145531
1999-06-30	135374
1999-09-30	145309
1999-12-31	147696
2000-03-31	155680
2000-06-30	163115
2000-09-30	154524
2000-12-31	162761
2001-03-31	161938
2001-06-30	168465
2001-09-30	168081
2001-12-31	149415
2002-03-31	135773
2002-06-30	138136
2002-09-30	133146
2002-12-31	158384
2003-03-31	134761
2003-06-30	123238
2003-09-30	116055
2003-12-31	117147
2004-03-31	125083
2004-06-30	118091
2004-09-30	125336
2004-12-31	139345
2005-03-31	118209
2005-06-30	128289
2005-09-30	134214
2005-12-31	138237
2006-03-31	119683
2006-06-30	137734
2006-09-30	132459
2006-12-31	128199
2007-03-31	135629
2007-06-30	150771
2007-09-30	179353
2007-12-31	205916
2008-03-31	199163
2008-06-30	206914
2008-09-30	198400
2008-12-31	206806
2009-03-31	178433
2009-06-30	209658
2009-09-30	206486
2009-12-31	184327
2010-03-31	176528
2010-06-30	166332
2010-09-30	172267
2010-12-31	161560
2011-03-31	182359
2011-06-30	188312
2011-09-30	186994
2011-12-31	199082
2012-03-31	177961
2012-06-30	189139
2012-09-30	197263
2012-12-31	193564
2013-03-31	193888
2013-06-30	188191
2013-09-30	202408
2013-12-31	209818
2014-03-31	198590
2014-06-30	202750
2014-09-30	183334
2014-12-31	199810
2015-03-31	183587
2015-06-30	188653
2015-09-30	199918
2015-12-31	223628
2016-03-31	209648
2016-06-30	232624
2016-09-30	229803
2016-12-31	202227
2017-03-31	191980
2017-06-30	196399
2017-09-30	209871
2017-12-31	226788
2018-03-31	235398
2018-06-30	225718
2018-09-30	230475
2018-12-31	251860
2019-03-31	249753
2019-06-30	249631
2019-09-30	250022
2019-12-31	259926
2020-03-31	286023
2020-06-30	274955
2020-09-30	278338
2020-12-31	307893
2021-03-31	294956
2021-06-30	296370
2021-09-30	286763
2021-12-31	299571
2022-03-31	312480
2022-06-30	295590
2022-09-30	306345
2022-12-31	318972
2023-03-31	299218
2023-06-30	286266
2023-09-30	295676