Quarter	US dollars
1999-03-31	98629
1999-06-30	94976
1999-09-30	95926
1999-12-31	100230
2000-03-31	97065
2000-06-30	98993
2000-09-30	98759
2000-12-31	106238
2001-03-31	123208
2001-06-30	115480
2001-09-30	146089
2001-12-31	138595
2002-03-31	137372
2002-06-30	164495
2002-09-30	174308
2002-12-31	194047
2003-03-31	232654
2003-06-30	281685
2003-09-30	260591
2003-12-31	287110
2004-03-31	305745
2004-06-30	303728
2004-09-30	345511
2004-12-31	402198
2005-03-31	418273
2005-06-30	402414
2005-09-30	397885
2005-12-31	352639
2006-03-31	419914
2006-06-30	461718
2006-09-30	436553
2006-12-31	462512
2007-03-31	469638
2007-06-30	498590
2007-09-30	526709
2007-12-31	545780
2008-03-31	597378
2008-06-30	571531
2008-09-30	559442
2008-12-31	519294
2009-03-31	456171
2009-06-30	472112
2009-09-30	442808
2009-12-31	454319
2010-03-31	407365
2010-06-30	373886
2010-09-30	367408
2010-12-31	380616
2011-03-31	375506
2011-06-30	382030
2011-09-30	386625
2011-12-31	371196
2012-03-31	398803
2012-06-30	364173
2012-09-30	397722
2012-12-31	380074
2013-03-31	349021
2013-06-30	337958
2013-09-30	317901
2013-12-31	342663
2014-03-31	347516
2014-06-30	348689
2014-09-30	306817
2014-12-31	286569
2015-03-31	275982
2015-06-30	261520
2015-09-30	241168
2015-12-31	214494
2016-03-31	237857
2016-06-30	250166
2016-09-30	225023
2016-12-31	212056
2017-03-31	224760
2017-06-30	253621
2017-09-30	231826
2017-12-31	206702
2018-03-31	238316
2018-06-30	235410
2018-09-30	242813
2018-12-31	236629
2019-03-31	254267
2019-06-30	260542
2019-09-30	252471
2019-12-31	234694
2020-03-31	277320
2020-06-30	272788
2020-09-30	311553
2020-12-31	306005
2021-03-31	360077
2021-06-30	359831
2021-09-30	331116
2021-12-31	331116
2022-03-31	341473
2022-06-30	307086
2022-09-30	292986
2022-12-31	295603
2023-03-31	288559
2023-06-30	299775
2023-09-30	313110