Quarter	US dollars
1986-09-30	13512
1986-12-31	17331
1987-03-31	17334
1987-06-30	15565
1987-09-30	15074
1987-12-31	18186
1988-03-31	17729
1988-06-30	16227
1988-09-30	17114
1988-12-31	18311
1989-03-31	18070
1989-06-30	20730
1989-09-30	23231
1989-12-31	23867
1990-03-31	26364
1990-06-30	31227
1990-09-30	35924
1990-12-31	38253
1991-03-31	35254
1991-06-30	33355
1991-09-30	36009
1991-12-31	36275
1992-03-31	28663
1992-06-30	27335
1992-09-30	29974
1992-12-31	27019
1993-03-31	26235
1993-06-30	29876
1993-09-30	30298
1993-12-31	35936
1994-03-31	34212
1994-06-30	36083
1994-09-30	37332
1994-12-31	40075
1995-03-31	41673
1995-06-30	40168
1995-09-30	41801
1995-12-31	48301
1996-03-31	53169
1996-06-30	59037
1996-09-30	60335
1996-12-31	74637
1997-03-31	67333
1997-06-30	70249
1997-09-30	75421
1997-12-31	73323
1998-03-31	74823
1998-06-30	72053
1998-09-30	74975
1998-12-31	57956
1999-03-31	51726
1999-06-30	56596
1999-09-30	52433
1999-12-31	42568
2000-03-31	46197
2000-06-30	46962
2000-09-30	39648
2000-12-31	42473
2001-03-31	47783
2001-06-30	46853
2001-09-30	47679
2001-12-31	40503
2002-03-31	44663
2002-06-30	42292
2002-09-30	41653
2002-12-31	58431
2003-03-31	50482
2003-06-30	66527
2003-09-30	68778
2003-12-31	66376
2004-03-31	70307
2004-06-30	65416
2004-09-30	69118
2004-12-31	66960
2005-03-31	61644
2005-06-30	62356
2005-09-30	67196
2005-12-31	58670
2006-03-31	59186
2006-06-30	65907
2006-09-30	79240
2006-12-31	79640
2007-03-31	95647
2007-06-30	94583
2007-09-30	89490
2007-12-31	82220
2008-03-31	77982
2008-06-30	83218
2008-09-30	78821
2008-12-31	60700
2009-03-31	58796
2009-06-30	60581
2009-09-30	62613
2009-12-31	74213
2010-03-31	68393
2010-06-30	64688
2010-09-30	81197
2010-12-31	79101
2011-03-31	89549
2011-06-30	91107
2011-09-30	90940
2011-12-31	91751
2012-03-31	124409
2012-06-30	122802
2012-09-30	121381
2012-12-31	122678
2013-03-31	121618
2013-06-30	107878
2013-09-30	105691
2013-12-31	100137
2014-03-31	95801
2014-06-30	101009
2014-09-30	104011
2014-12-31	95001
2015-03-31	91313
2015-06-30	86510
2015-09-30	78391
2015-12-31	74041
2016-03-31	70799
2016-06-30	65286
2016-09-30	57916
2016-12-31	52385
2017-03-31	58742
2017-06-30	59156
2017-09-30	59651
2017-12-31	60745
2018-03-31	61499
2018-06-30	63701
2018-09-30	56424
2018-12-31	52978
2019-03-31	47200
2019-06-30	48250
2019-09-30	45249
2019-12-31	42573
2020-03-31	46733
2020-06-30	46162
2020-09-30	44639
2020-12-31	47242
2021-03-31	37885
2021-06-30	36166
2021-09-30	33120
2021-12-31	32514
2022-03-31	31207
2022-06-30	25727
2022-09-30	22967
2022-12-31	23706
2023-03-31	24739
2023-06-30	25757
2023-09-30	23832