Quarter	US dollars
1986-09-30	9373
1986-12-31	13099
1987-03-31	15761
1987-06-30	14068
1987-09-30	15285
1987-12-31	17821
1988-03-31	16225
1988-06-30	14641
1988-09-30	14712
1988-12-31	16264
1989-03-31	15072
1989-06-30	12349
1989-09-30	12780
1989-12-31	16102
1990-03-31	14955
1990-06-30	16500
1990-09-30	22331
1990-12-31	22245
1991-03-31	23129
1991-06-30	20602
1991-09-30	24456
1991-12-31	21703
1992-03-31	15063
1992-06-30	17389
1992-09-30	20143
1992-12-31	19827
1993-03-31	22196
1993-06-30	26657
1993-09-30	31617
1993-12-31	34822
1994-03-31	35125
1994-06-30	35727
1994-09-30	40497
1994-12-31	42730
1995-03-31	85669
1995-06-30	84316
1995-09-30	86083
1995-12-31	79777
1996-03-31	79431
1996-06-30	79352
1996-09-30	79458
1996-12-31	79820
1997-03-31	83007
1997-06-30	88771
1997-09-30	15028
1997-12-31	8602
1998-03-31	7859
1998-06-30	15141
1998-09-30	15005
1998-12-31	17532
1999-03-31	79903
1999-06-30	130707
1999-09-30	57936
1999-12-31	28509
2000-03-31	41880
2000-06-30	47128
2000-09-30	37869
2000-12-31	8716
2001-03-31	13436
2001-06-30	17022
2001-09-30	18286
2001-12-31	17441
2002-03-31	24782
2002-06-30	22591
2002-09-30	25095
2002-12-31	30191
2003-03-31	33943
2003-06-30	42068
2003-09-30	53046
2003-12-31	47436
2004-03-31	48409
2004-06-30	45886
2004-09-30	47305
2004-12-31	33139
2005-03-31	39347
2005-06-30	43168
2005-09-30	37572
2005-12-31	50233
2006-03-31	54406
2006-06-30	60862
2006-09-30	54569
2006-12-31	70904
2007-03-31	71377
2007-06-30	91395
2007-09-30	98875
2007-12-31	78283
2008-03-31	86186
2008-06-30	90158
2008-09-30	85605
2008-12-31	114765
2009-03-31	126638
2009-06-30	118364
2009-09-30	102885
2009-12-31	91382
2010-03-31	86086
2010-06-30	89275
2010-09-30	89461
2010-12-31	97287
2011-03-31	88193
2011-06-30	85243
2011-09-30	93033
2011-12-31	95709
2012-03-31	82464
2012-06-30	81116
2012-09-30	82646
2012-12-31	88305
2013-03-31	86691
2013-06-30	69191
2013-09-30	71966
2013-12-31	73411
2014-03-31	84787
2014-06-30	83538
2014-09-30	72685
2014-12-31	69004
2015-03-31	74998
2015-06-30	78687
2015-09-30	76231
2015-12-31	64350
2016-03-31	77180
2016-06-30	75688
2016-09-30	64296
2016-12-31	63563
2017-03-31	71966
2017-06-30	75856
2017-09-30	71874
2017-12-31	72204
2018-03-31	76074
2018-06-30	78203
2018-09-30	75334
2018-12-31	68107
2019-03-31	89846
2019-06-30	96053
2019-09-30	97447
2019-12-31	81350