Quarter	US dollars
1986-09-30	46792
1986-12-31	47802
1987-03-31	54832
1987-06-30	57188
1987-09-30	65381
1987-12-31	79383
1988-03-31	79052
1988-06-30	75432
1988-09-30	89040
1988-12-31	83318
1989-03-31	84215
1989-06-30	79148
1989-09-30	83964
1989-12-31	87182
1990-03-31	86296
1990-06-30	86344
1990-09-30	108555
1990-12-31	110118
1991-03-31	94549
1991-06-30	90755
1991-09-30	94438
1991-12-31	90713
1992-03-31	81943
1992-06-30	73870
1992-09-30	72564
1992-12-31	59036
1993-03-31	59810
1993-06-30	54666
1993-09-30	58914
1993-12-31	53703
1994-03-31	60084
1994-06-30	60387
1994-09-30	66979
1994-12-31	66453
1995-03-31	77912
1995-06-30	70517
1995-09-30	79454
1995-12-31	84786
1996-03-31	76505
1996-06-30	81810
1996-09-30	83203
1996-12-31	90216
1997-03-31	93260
1997-06-30	109131
1997-09-30	99848
1997-12-31	120488
1998-03-31	97681
1998-06-30	97696
1998-09-30	106321
1998-12-31	147007
1999-03-31	110478
1999-06-30	86498
1999-09-30	108363
1999-12-31	122537
2000-03-31	123606
2000-06-30	129766
2000-09-30	127497
2000-12-31	146514
2001-03-31	101564
2001-06-30	97111
2001-09-30	96590
2001-12-31	82184
2002-03-31	75114
2002-06-30	88482
2002-09-30	82726
2002-12-31	102686
2003-03-31	78195
2003-06-30	88840
2003-09-30	74072
2003-12-31	93605
2004-03-31	97715
2004-06-30	101033
2004-09-30	91508
2004-12-31	108578
2005-03-31	83194
2005-06-30	88833
2005-09-30	81363
2005-12-31	70577
2006-03-31	60651
2006-06-30	59722
2006-09-30	63771
2006-12-31	47828
2007-03-31	59408
2007-06-30	55687
2007-09-30	58472
2007-12-31	86074
2008-03-31	101548
2008-06-30	91657
2008-09-30	90227
2008-12-31	100702
2009-03-31	82750
2009-06-30	102863
2009-09-30	127792
2009-12-31	90087
2010-03-31	101408
2010-06-30	113045
2010-09-30	130409
2010-12-31	136860
2011-03-31	114827
2011-06-30	103225
2011-09-30	132633
2011-12-31	114562
2012-03-31	113298
2012-06-30	125034
2012-09-30	114347
2012-12-31	98759
2013-03-31	101447
2013-06-30	80989
2013-09-30	94730
2013-12-31	75413
2014-03-31	72934
2014-06-30	89385
2014-09-30	85374
2014-12-31	84754
2015-03-31	68709
2015-06-30	74579
2015-09-30	69062
2015-12-31	79518