Quarter	US dollars
1986-09-30	18120
1986-12-31	17765
1987-03-31	17065
1987-06-30	18268
1987-09-30	17614
1987-12-31	18704
1988-03-31	19912
1988-06-30	20510
1988-09-30	22421
1988-12-31	24450
1989-03-31	25210
1989-06-30	27077
1989-09-30	24988
1989-12-31	25468
1990-03-31	23993
1990-06-30	23417
1990-09-30	26884
1990-12-31	31316
1991-03-31	31318
1991-06-30	32974
1991-09-30	33457
1991-12-31	31380
1992-03-31	29396
1992-06-30	30015
1992-09-30	24941
1992-12-31	23241
1993-03-31	21705
1993-06-30	22701
1993-09-30	22685
1993-12-31	24075
1994-03-31	24682
1994-06-30	24409
1994-09-30	22828
1994-12-31	21521
1995-03-31	24848
1995-06-30	24625
1995-09-30	19153
1995-12-31	21172
1996-03-31	25438
1996-06-30	24516
1996-09-30	21270
1996-12-31	23738
1997-03-31	21657
1997-06-30	21909
1997-09-30	20689
1997-12-31	20814
1998-03-31	21878
1998-06-30	19557
1998-09-30	29543
1998-12-31	28592
1999-03-31	19325
1999-06-30	15768
1999-09-30	17809
1999-12-31	18103
2000-03-31	17529
2000-06-30	17477
2000-09-30	21028
2000-12-31	24785
2001-03-31	28798
2001-06-30	27827
2001-09-30	24091
2001-12-31	18472
2002-03-31	15639
2002-06-30	15900
2002-09-30	17678
2002-12-31	20448
2003-03-31	26672
2003-06-30	16725
2003-09-30	18325
2003-12-31	20278
2004-03-31	27615
2004-06-30	28238
2004-09-30	40434
2004-12-31	25866
2005-03-31	23085
2005-06-30	30086
2005-09-30	36680
2005-12-31	36365
2006-03-31	37333
2006-06-30	36560
2006-09-30	45132
2006-12-31	50811
2007-03-31	48191
2007-06-30	42980
2007-09-30	59142
2007-12-31	97655
2008-03-31	107080
2008-06-30	92702
2008-09-30	101419
2008-12-31	95897
2009-03-31	74507
2009-06-30	70807
2009-09-30	77000
2009-12-31	80930
2010-03-31	72133
2010-06-30	67748
2010-09-30	61123
2010-12-31	66767
2011-03-31	71115
2011-06-30	80905
2011-09-30	92596
2011-12-31	93824
2012-03-31	111959
2012-06-30	120189
2012-09-30	98833
2012-12-31	95763
2013-03-31	93632
2013-06-30	84427
2013-09-30	92600
2013-12-31	103043
2014-03-31	103962
2014-06-30	97038
2014-09-30	98739
2014-12-31	87762
2015-03-31	82660
2015-06-30	91575
2015-09-30	101461
2015-12-31	97249
2016-03-31	89532
2016-06-30	90487
2016-09-30	81278
2016-12-31	81471
2017-03-31	91352
2017-06-30	100470
2017-09-30	94429
2017-12-31	95278
2018-03-31	100060
2018-06-30	92524
2018-09-30	90058
2018-12-31	87360
2019-03-31	88329
2019-06-30	108422
2019-09-30	103033
2019-12-31	105396
2020-03-31	109963
2020-06-30	88959
2020-09-30	88909
2020-12-31	79360
2021-03-31	77415
2021-06-30	72115
2021-09-30	76677
2021-12-31	69122
2022-03-31	81170
2022-06-30	90480
2022-09-30	92830
2022-12-31	76903
2023-03-31	79584
2023-06-30	99607
2023-09-30	83149