Quarter	US dollars
1999-03-31	16859
1999-06-30	16150
1999-09-30	18484
1999-12-31	16481
2000-03-31	18818
2000-06-30	19640
2000-09-30	19697
2000-12-31	20400
2001-03-31	20653
2001-06-30	21193
2001-09-30	23602
2001-12-31	20355
2002-03-31	15384
2002-06-30	14851
2002-09-30	13857
2002-12-31	14787
2003-03-31	17319
2003-06-30	17990
2003-09-30	20018
2003-12-31	20257
2004-03-31	19364
2004-06-30	18928
2004-09-30	19432
2004-12-31	21707
2005-03-31	25299
2005-06-30	20798
2005-09-30	23079
2005-12-31	23202
2006-03-31	24857
2006-06-30	24891
2006-09-30	30281
2006-12-31	27117
2007-03-31	25658
2007-06-30	30814
2007-09-30	28259
2007-12-31	28442
2008-03-31	27360
2008-06-30	29040
2008-09-30	30148
2008-12-31	20215
2009-03-31	16274
2009-06-30	17890
2009-09-30	18416
2009-12-31	17745
2010-03-31	18406
2010-06-30	21846
2010-09-30	27010
2010-12-31	25986
2011-03-31	25008
2011-06-30	25361
2011-09-30	22192
2011-12-31	20129
2012-03-31	21076
2012-06-30	16241
2012-09-30	15073
2012-12-31	16149
2013-03-31	16938
2013-06-30	21522
2013-09-30	26770
2013-12-31	25524
2014-03-31	23819
2014-06-30	24056
2014-09-30	26355
2014-12-31	29277
2015-03-31	28030
2015-06-30	30334
2015-09-30	30923
2015-12-31	36658
2016-03-31	23736
2016-06-30	24404
2016-09-30	23785
2016-12-31	24744
2017-03-31	25996
2017-06-30	21587
2017-09-30	20441
2017-12-31	18664
2018-03-31	20673
2018-06-30	23388
2018-09-30	23682
2018-12-31	23609
2019-03-31	21250
2019-06-30	20753
2019-09-30	26122
2019-12-31	23240
2020-03-31	28436
2020-06-30	25398
2020-09-30	24565
2020-12-31	31914
2021-03-31	31340
2021-06-30	30284
2021-09-30	31370
2021-12-31	43308
2022-03-31	40472
2022-06-30	25541
2022-09-30	43658
2022-12-31	44535
2023-03-31	49836
2023-06-30	47011
2023-09-30	29711