Quarter	US dollars
1999-03-31	106333
1999-06-30	101553
1999-09-30	107981
1999-12-31	98674
2000-03-31	102542
2000-06-30	122177
2000-09-30	122547
2000-12-31	126822
2001-03-31	128583
2001-06-30	118936
2001-09-30	123832
2001-12-31	100248
2002-03-31	114702
2002-06-30	99193
2002-09-30	102075
2002-12-31	106186
2003-03-31	117550
2003-06-30	126315
2003-09-30	133409
2003-12-31	137339
2004-03-31	159780
2004-06-30	157430
2004-09-30	151878
2004-12-31	180900
2005-03-31	173592
2005-06-30	194568
2005-09-30	176801
2005-12-31	187877
2006-03-31	202335
2006-06-30	229489
2006-09-30	218928
2006-12-31	221711
2007-03-31	211362
2007-06-30	235140
2007-09-30	278856
2007-12-31	258090
2008-03-31	270370
2008-06-30	257315
2008-09-30	258219
2008-12-31	211021
2009-03-31	252981
2009-06-30	202308
2009-09-30	227412
2009-12-31	230049
2010-03-31	222846
2010-06-30	235244
2010-09-30	257409
2010-12-31	270648
2011-03-31	285632
2011-06-30	308967
2011-09-30	306011
2011-12-31	313559
2012-03-31	293117
2012-06-30	289860
2012-09-30	266699
2012-12-31	267278
2013-03-31	265247
2013-06-30	254059
2013-09-30	274765
2013-12-31	306563
2014-03-31	332251
2014-06-30	361457
2014-09-30	359771
2014-12-31	310858
2015-03-31	286329
2015-06-30	275633
2015-09-30	246640
2015-12-31	240365
2016-03-31	238548
2016-06-30	264897
2016-09-30	278077
2016-12-31	256736
2017-03-31	265854
2017-06-30	259052
2017-09-30	270630
2017-12-31	265491
2018-03-31	279638
2018-06-30	267280
2018-09-30	253385
2018-12-31	223993
2019-03-31	233789
2019-06-30	236858
2019-09-30	226663
2019-12-31	222616
2020-03-31	250018
2020-06-30	193675
2020-09-30	188874
2020-12-31	204795
2021-03-31	226056
2021-06-30	214011
2021-09-30	231222
2021-12-31	221951
2022-03-31	250305
2022-06-30	229000
2022-09-30	245339
2022-12-31	241770
2023-03-31	270128
2023-06-30	258421
2023-09-30	207214