Quarter	US dollars
1999-03-31	68215
1999-06-30	64854
1999-09-30	64174
1999-12-31	63980
2000-03-31	63778
2000-06-30	62253
2000-09-30	63832
2000-12-31	61540
2001-03-31	60692
2001-06-30	59081
2001-09-30	58910
2001-12-31	61011
2002-03-31	62676
2002-06-30	63889
2002-09-30	62791
2002-12-31	66410
2003-03-31	66016
2003-06-30	67137
2003-09-30	72378
2003-12-31	70913
2004-03-31	83017
2004-06-30	81085
2004-09-30	83379
2004-12-31	93723
2005-03-31	86883
2005-06-30	90210
2005-09-30	96002
2005-12-31	105595
2006-03-31	121766
2006-06-30	121234
2006-09-30	135049
2006-12-31	144755
2007-03-31	153984
2007-06-30	182662
2007-09-30	189129
2007-12-31	204271
2008-03-31	215198
2008-06-30	222212
2008-09-30	207900
2008-12-31	193261
2009-03-31	186862
2009-06-30	184122
2009-09-30	188335
2009-12-31	185923
2010-03-31	191066
2010-06-30	188142
2010-09-30	199642
2010-12-31	195782
2011-03-31	198209
2011-06-30	207786
2011-09-30	196111
2011-12-31	194233
2012-03-31	197401
2012-06-30	198938
2012-09-30	202816
2012-12-31	203609
2013-03-31	209490
2013-06-30	194062
2013-09-30	203779
2013-12-31	208346
2014-03-31	199887
2014-06-30	200535
2014-09-30	194831
2014-12-31	184481
2015-03-31	177248
2015-06-30	177448
2015-09-30	180226
2015-12-31	179129
2016-03-31	169452
2016-06-30	176278
2016-09-30	174193
2016-12-31	163078
2017-03-31	167847
2017-06-30	171313
2017-09-30	179448
2017-12-31	190407
2018-03-31	195518
2018-06-30	180535
2018-09-30	180690
2018-12-31	188384
2019-03-31	195074
2019-06-30	196072
2019-09-30	192463
2019-12-31	198792
2020-03-31	198868
2020-06-30	192337
2020-09-30	197207
2020-12-31	212306
2021-03-31	198609
2021-06-30	195711
2021-09-30	192122
2021-12-31	189954
2022-03-31	189734
2022-06-30	183600
2022-09-30	177222
2022-12-31	188367
2023-03-31	187219
2023-06-30	189120
2023-09-30	191327