Quarter	US dollars
1999-09-30	128022
1999-12-31	118388
2000-03-31	121406
2000-06-30	118338
2000-09-30	122848
2000-12-31	114571
2001-03-31	135113
2001-06-30	119093
2001-09-30	125743
2001-12-31	106100
2002-03-31	109882
2002-06-30	109144
2002-09-30	119253
2002-12-31	126261
2003-03-31	136390
2003-06-30	141152
2003-09-30	126976
2003-12-31	119511
2004-03-31	137285
2004-06-30	133225
2004-09-30	126206
2004-12-31	149969
2005-03-31	150846
2005-06-30	129976
2005-09-30	134546
2005-12-31	134578
2006-03-31	158594
2006-06-30	151222
2006-09-30	163454
2006-12-31	185158
2007-03-31	207896
2007-06-30	204386
2007-09-30	237500
2007-12-31	214207
2008-03-31	222199
2008-06-30	154366
2008-09-30	168150
2008-12-31	115319
2009-03-31	102753
2009-06-30	102039
2009-09-30	99688
2009-12-31	91430
2010-03-31	95987
2010-06-30	85096
2010-09-30	84669
2010-12-31	95812
2011-03-31	93665
2011-06-30	95668
2011-09-30	72562
2011-12-31	68927
2012-03-31	79593
2012-06-30	71196
2012-09-30	66582
2012-12-31	72020
2013-03-31	75908
2013-06-30	67037
2013-09-30	68143
2013-12-31	67763
2014-03-31	71432
2014-06-30	75500
2014-09-30	71052
2014-12-31	65348
2015-03-31	63640
2015-06-30	61607
2015-09-30	66745
2015-12-31	57690
2016-03-31	61677
2016-06-30	67607
2016-09-30	58245
2016-12-31	60549
2017-03-31	70268
2017-06-30	63094
2017-09-30	60168
2017-12-31	63327
2018-03-31	69278
2018-06-30	63719
2018-09-30	62165
2018-12-31	55251
2019-03-31	57234
2019-06-30	39625
2019-09-30	48085
2019-12-31	50017
2020-03-31	50106
2020-06-30	54257
2020-09-30	41166
2020-12-31	45700
2021-03-31	48366
2021-06-30	48513
2021-09-30	50835
2021-12-31	52816
2022-03-31	55100
2022-06-30	46780
2022-09-30	38678
2022-12-31	38416
2023-03-31	36941
2023-06-30	39226
2023-09-30	33955