Quarter	US dollars
1999-03-31	143708
1999-06-30	133951
1999-09-30	170184
1999-12-31	193449
2000-03-31	202076
2000-06-30	194861
2000-09-30	191144
2000-12-31	231587
2001-03-31	226822
2001-06-30	191507
2001-09-30	205213
2001-12-31	206266
2002-03-31	198404
2002-06-30	220391
2002-09-30	222471
2002-12-31	245755
2003-03-31	266789
2003-06-30	282869
2003-09-30	272453
2003-12-31	303826
2004-03-31	309087
2004-06-30	322330
2004-09-30	267585
2004-12-31	296884
2005-03-31	313338
2005-06-30	320763
2005-09-30	313902
2005-12-31	273869
2006-03-31	313254
2006-06-30	328366
2006-09-30	303044
2006-12-31	235987
2007-03-31	389064
2007-06-30	348858
2007-09-30	354124
2007-12-31	461470
2008-03-31	470274
2008-06-30	309286
2008-09-30	293054
2008-12-31	209920
2009-03-31	214259
2009-06-30	213441
2009-09-30	225388
2009-12-31	188418
2010-03-31	189240
2010-06-30	188664
2010-09-30	191537
2010-12-31	220218
2011-03-31	170756
2011-06-30	183479
2011-09-30	190386
2011-12-31	200026
2012-03-31	177862
2012-06-30	157371
2012-09-30	170177
2012-12-31	180049
2013-03-31	181750
2013-06-30	193784
2013-09-30	223132
2013-12-31	217805
2014-03-31	217354
2014-06-30	239445
2014-09-30	206551
2014-12-31	200582
2015-03-31	179094
2015-06-30	178322
2015-09-30	173237
2015-12-31	168504
2016-03-31	115703
2016-06-30	129617
2016-09-30	130937
2016-12-31	136783
2017-03-31	128482
2017-06-30	166353
2017-09-30	150241
2017-12-31	148816
2018-03-31	129008
2018-06-30	137707
2018-09-30	121594
2018-12-31	132902
2019-03-31	125724
2019-06-30	130605
2019-09-30	116716
2019-12-31	118401
2020-03-31	104632
2020-06-30	108605
2020-09-30	117312
2020-12-31	122827
2021-03-31	145907
2021-06-30	127894
2021-09-30	138813
2021-12-31	139335
2022-03-31	135438
2022-06-30	140277
2022-09-30	105506
2022-12-31	143068
2023-03-31	196015
2023-06-30	173975
2023-09-30	168730