Quarter	US dollars
1986-09-30	25628
1986-12-31	27868
1987-03-31	32160
1987-06-30	34448
1987-09-30	37909
1987-12-31	43002
1988-03-31	48810
1988-06-30	55685
1988-09-30	59234
1988-12-31	57744
1989-03-31	56694
1989-06-30	56042
1989-09-30	63616
1989-12-31	63740
1990-03-31	70363
1990-06-30	72389
1990-09-30	81568
1990-12-31	90354
1991-03-31	83938
1991-06-30	71679
1991-09-30	73314
1991-12-31	72740
1992-03-31	68076
1992-06-30	74583
1992-09-30	76162
1992-12-31	61502
1993-03-31	61318
1993-06-30	58692
1993-09-30	56290
1993-12-31	58220
1994-03-31	56197
1994-06-30	56178
1994-09-30	69991
1994-12-31	75440
1995-03-31	88597
1995-06-30	92946
1995-09-30	89628
1995-12-31	84231
1996-03-31	80046
1996-06-30	72511
1996-09-30	74445
1996-12-31	89876
1997-03-31	91878
1997-06-30	92821
1997-09-30	131310
1997-12-31	143825
1998-03-31	149140
1998-06-30	154275
1998-09-30	169445
1998-12-31	175279
1999-03-31	181247
1999-06-30	183116
1999-09-30	207462
1999-12-31	206638
2000-03-31	213572
2000-06-30	210777
2000-09-30	208217
2000-12-31	226808
2001-03-31	239903
2001-06-30	219995
2001-09-30	234428
2001-12-31	241782
2002-03-31	238321
2002-06-30	251493
2002-09-30	263963
2002-12-31	269043
2003-03-31	275324
2003-06-30	296411
2003-09-30	299688
2003-12-31	321800
2004-03-31	362127
2004-06-30	359836
2004-09-30	345221
2004-12-31	378019
2005-03-31	382543
2005-06-30	373552
2005-09-30	378670
2005-12-31	359411
2006-03-31	363522
2006-06-30	433549
2006-09-30	452389
2006-12-31	497880
2007-03-31	666117
2007-06-30	680322
2007-09-30	745181
2007-12-31	857327
2008-03-31	890065
2008-06-30	809976
2008-09-30	732049
2008-12-31	585226
2009-03-31	621531
2009-06-30	679036
2009-09-30	619653
2009-12-31	581690
2010-03-31	544538
2010-06-30	537690
2010-09-30	568753
2010-12-31	516328
2011-03-31	468400
2011-06-30	480070
2011-09-30	434026
2011-12-31	408109
2012-03-31	438535
2012-06-30	447752
2012-09-30	472449
2012-12-31	476857
2013-03-31	410397
2013-06-30	412934
2013-09-30	442188
2013-12-31	419655
2014-03-31	438447
2014-06-30	438985
2014-09-30	401494
2014-12-31	392416
2015-03-31	389249
2015-06-30	426789
2015-09-30	457303
2015-12-31	438187