Quarter	US dollars
1986-09-30	16157
1986-12-31	17223
1987-03-31	17060
1987-06-30	18082
1987-09-30	18397
1987-12-31	19505
1988-03-31	19082
1988-06-30	20296
1988-09-30	19719
1988-12-31	21425
1989-03-31	20568
1989-06-30	20864
1989-09-30	20283
1989-12-31	21141
1990-03-31	20048
1990-06-30	18624
1990-09-30	19354
1990-12-31	18256
1991-03-31	18737
1991-06-30	15328
1991-09-30	15895
1991-12-31	16722
1992-03-31	14216
1992-06-30	14003
1992-09-30	22091
1992-12-31	14611
1993-03-31	16643
1993-06-30	14625
1993-09-30	17206
1993-12-31	22440
1994-03-31	10567
1994-06-30	13044
1994-09-30	14239
1994-12-31	11813
1995-03-31	6828
1995-06-30	14001
1995-09-30	14732
1995-12-31	13235
1996-03-31	4934
1996-06-30	8226
1996-09-30	6705
1996-12-31	5772
1997-03-31	7979
1997-06-30	5754
1997-09-30	4495
1997-12-31	4613
1998-03-31	4644
1998-06-30	6668
1998-09-30	5872
1998-12-31	3743
1999-03-31	70933
1999-06-30	127958
1999-09-30	52273
1999-12-31	13812
2000-03-31	34905
2000-06-30	39344
2000-09-30	32220
2000-12-31	9483
2001-03-31	7992
2001-06-30	10232
2001-09-30	11162
2001-12-31	10962
2002-03-31	11067
2002-06-30	11728
2002-09-30	16277
2002-12-31	14847
2003-03-31	20192
2003-06-30	20796
2003-09-30	29285
2003-12-31	25172
2004-03-31	32589
2004-06-30	34284
2004-09-30	45758
2004-12-31	38860
2005-03-31	63501
2005-06-30	52652
2005-09-30	62935
2005-12-31	59309
2006-03-31	68330
2006-06-30	68354
2006-09-30	79255
2006-12-31	64469
2007-03-31	85019
2007-06-30	95535
2007-09-30	106008
2007-12-31	92024
2008-03-31	83904
2008-06-30	71765
2008-09-30	64012
2008-12-31	39922
2009-03-31	45881
2009-06-30	59275
2009-09-30	39832
2009-12-31	32445
2010-03-31	46548
2010-06-30	49756
2010-09-30	49473
2010-12-31	48660
2011-03-31	57328
2011-06-30	38114
2011-09-30	41678
2011-12-31	27913
2012-03-31	29430
2012-06-30	17113
2012-09-30	26413
2012-12-31	27082
2013-03-31	47883
2013-06-30	45037
2013-09-30	28838
2013-12-31	39796
2014-03-31	37692
2014-06-30	33627
2014-09-30	27745
2014-12-31	32538
2015-03-31	30690
2015-06-30	41846
2015-09-30	52727
2015-12-31	56423