Quarter	US dollars
1986-09-30	12944
1986-12-31	12107
1987-03-31	12109
1987-06-30	12602
1987-09-30	15098
1987-12-31	14731
1988-03-31	15643
1988-06-30	16133
1988-09-30	15175
1988-12-31	15409
1989-03-31	15562
1989-06-30	16748
1989-09-30	15816
1989-12-31	16649
1990-03-31	16742
1990-06-30	17512
1990-09-30	18153
1990-12-31	18900
1991-03-31	17768
1991-06-30	15695
1991-09-30	17383
1991-12-31	17527
1992-03-31	15545
1992-06-30	14595
1992-09-30	15414
1992-12-31	15911
1993-03-31	16302
1993-06-30	17487
1993-09-30	18172
1993-12-31	15604
1994-03-31	13720
1994-06-30	8457
1994-09-30	8347
1994-12-31	8872
1995-03-31	10301
1995-06-30	6157
1995-09-30	8944
1995-12-31	12168
1996-03-31	11971
1996-06-30	6831
1996-09-30	12392
1996-12-31	6446
1997-03-31	13052
1997-06-30	7998
1997-09-30	6992
1997-12-31	8004
1998-03-31	9417
1998-06-30	13441
1998-09-30	17731
1998-12-31	12559
1999-03-31	14789
1999-06-30	15480
1999-09-30	21182
1999-12-31	4683
2000-03-31	15754
2000-06-30	28471
2000-09-30	27197
2000-12-31	40248
2001-03-31	24598
2001-06-30	23988
2001-09-30	12545
2001-12-31	11528
2002-03-31	26286
2002-06-30	14420
2002-09-30	16331
2002-12-31	14443
2003-03-31	20435
2003-06-30	23275
2003-09-30	24903
2003-12-31	28780
2004-03-31	42185
2004-06-30	38576
2004-09-30	36430
2004-12-31	38765
2005-03-31	35574
2005-06-30	42063
2005-09-30	39002
2005-12-31	41925
2006-03-31	50484
2006-06-30	49329
2006-09-30	43031
2006-12-31	37189
2007-03-31	37742
2007-06-30	26238
2007-09-30	25869
2007-12-31	18312
2008-03-31	22298
2008-06-30	17498
2008-09-30	18093
2008-12-31	19221
2009-03-31	12047
2009-06-30	15104
2009-09-30	15170
2009-12-31	14618
2010-03-31	14302
2010-06-30	10241
2010-09-30	11326
2010-12-31	11430
2011-03-31	8831
2011-06-30	11898
2011-09-30	14098
2011-12-31	13372
2012-03-31	10341
2012-06-30	12479
2012-09-30	15158
2012-12-31	12788
2013-03-31	16625
2013-06-30	13105
2013-09-30	11927
2013-12-31	9961
2014-03-31	9797
2014-06-30	9059
2014-09-30	7649
2014-12-31	11754
2015-03-31	10946
2015-06-30	10742
2015-09-30	12783
2015-12-31	10151
2016-03-31	10653
2016-06-30	8762
2016-09-30	7859
2016-12-31	6957
2017-03-31	9058
2017-06-30	7666
2017-09-30	9879
2017-12-31	8453
2018-03-31	8474
2018-06-30	7673
2018-09-30	7055
2018-12-31	6728
2019-03-31	7583
2019-06-30	7369
2019-09-30	6827
2019-12-31	7695
2020-03-31	8421
2020-06-30	8283
2020-09-30	8523
2020-12-31	8035
2021-03-31	7151
2021-06-30	4942
2021-09-30	5114
2021-12-31	5040
2022-03-31	4476
2022-06-30	4463
2022-09-30	4733
2022-12-31	5040
2023-03-31	5033
2023-06-30	4116
2023-09-30	2724