Quarter	US dollars
1999-03-31	47947
1999-06-30	44598
1999-09-30	46305
1999-12-31	48459
2000-03-31	49707
2000-06-30	52097
2000-09-30	60581
2000-12-31	64279
2001-03-31	72918
2001-06-30	71427
2001-09-30	73549
2001-12-31	66238
2002-03-31	58300
2002-06-30	61077
2002-09-30	60056
2002-12-31	68867
2003-03-31	74647
2003-06-30	69994
2003-09-30	72440
2003-12-31	76177
2004-03-31	83485
2004-06-30	82854
2004-09-30	99061
2004-12-31	92658
2005-03-31	92785
2005-06-30	102738
2005-09-30	115815
2005-12-31	117535
2006-03-31	132286
2006-06-30	137974
2006-09-30	154045
2006-12-31	161231
2007-03-31	159768
2007-06-30	161593
2007-09-30	177039
2007-12-31	224106
2008-03-31	231339
2008-06-30	194874
2008-09-30	215600
2008-12-31	202806
2009-03-31	161867
2009-06-30	161189
2009-09-30	164419
2009-12-31	174375
2010-03-31	165596
2010-06-30	154225
2010-09-30	143221
2010-12-31	155196
2011-03-31	170150
2011-06-30	172704
2011-09-30	166325
2011-12-31	174313
2012-03-31	194184
2012-06-30	212361
2012-09-30	185972
2012-12-31	180100
2013-03-31	188409
2013-06-30	174467
2013-09-30	184385
2013-12-31	194749
2014-03-31	192414
2014-06-30	188064
2014-09-30	189012
2014-12-31	182280
2015-03-31	167920
2015-06-30	179200
2015-09-30	186783
2015-12-31	179198
2016-03-31	169156
2016-06-30	167231
2016-09-30	159503
2016-12-31	161648
2017-03-31	179442
2017-06-30	180686
2017-09-30	178397
2017-12-31	180710
2018-03-31	195723
2018-06-30	182888
2018-09-30	180573
2018-12-31	175000
2019-03-31	186098
2019-06-30	199438
2019-09-30	174992
2019-12-31	178035
2020-03-31	170113
2020-06-30	157226
2020-09-30	152191
2020-12-31	149541
2021-03-31	150846
2021-06-30	144817
2021-09-30	143403
2021-12-31	133481
2022-03-31	140364
2022-06-30	161218
2022-09-30	150530
2022-12-31	139342
2023-03-31	153387
2023-06-30	169562
2023-09-30	152816