Quarter	US dollars
1999-03-31	121271
1999-06-30	106506
1999-09-30	119345
1999-12-31	119877
2000-03-31	146906
2000-06-30	147444
2000-09-30	146630
2000-12-31	141634
2001-03-31	133697
2001-06-30	140687
2001-09-30	122784
2001-12-31	114144
2002-03-31	112534
2002-06-30	113772
2002-09-30	101649
2002-12-31	127386
2003-03-31	112515
2003-06-30	109285
2003-09-30	109904
2003-12-31	121367
2004-03-31	121193
2004-06-30	133158
2004-09-30	123070
2004-12-31	136735
2005-03-31	103350
2005-06-30	100680
2005-09-30	102202
2005-12-31	123252
2006-03-31	109782
2006-06-30	125322
2006-09-30	109489
2006-12-31	111416
2007-03-31	117383
2007-06-30	125302
2007-09-30	155353
2007-12-31	173993
2008-03-31	195314
2008-06-30	190001
2008-09-30	182819
2008-12-31	198973
2009-03-31	140682
2009-06-30	148617
2009-09-30	118364
2009-12-31	108925
2010-03-31	99063
2010-06-30	95887
2010-09-30	88659
2010-12-31	94624
2011-03-31	103720
2011-06-30	104087
2011-09-30	112065
2011-12-31	127942
2012-03-31	125827
2012-06-30	122654
2012-09-30	130716
2012-12-31	130990
2013-03-31	117017
2013-06-30	97203
2013-09-30	97314
2013-12-31	95297
2014-03-31	82747
2014-06-30	83010
2014-09-30	87801
2014-12-31	96754
2015-03-31	90020
2015-06-30	66106
2015-09-30	69831
2015-12-31	81004
2016-03-31	80776
2016-06-30	92128
2016-09-30	82809
2016-12-31	82160
2017-03-31	73297
2017-06-30	80927
2017-09-30	81617
2017-12-31	82752
2018-03-31	79112
2018-06-30	85750
2018-09-30	80861
2018-12-31	91738
2019-03-31	79887
2019-06-30	79743
2019-09-30	85413
2019-12-31	78587
2020-03-31	113604
2020-06-30	110288
2020-09-30	84828
2020-12-31	82103
2021-03-31	94975
2021-06-30	87495
2021-09-30	85098
2021-12-31	93263
2022-03-31	123290
2022-06-30	152610
2022-09-30	132460
2022-12-31	137699
2023-03-31	121544
2023-06-30	126668
2023-09-30	122600