Quarter	US dollars
1986-09-30	45609
1986-12-31	49579
1987-03-31	55726
1987-06-30	56146
1987-09-30	61148
1987-12-31	72188
1988-03-31	76948
1988-06-30	77251
1988-09-30	77846
1988-12-31	76964
1989-03-31	70085
1989-06-30	69130
1989-09-30	71955
1989-12-31	73748
1990-03-31	77098
1990-06-30	85055
1990-09-30	93424
1990-12-31	97401
1991-03-31	88989
1991-06-30	76911
1991-09-30	80280
1991-12-31	82970
1992-03-31	78136
1992-06-30	92311
1992-09-30	107826
1992-12-31	86265
1993-03-31	86730
1993-06-30	84819
1993-09-30	87569
1993-12-31	99288
1994-03-31	88862
1994-06-30	92172
1994-09-30	99594
1994-12-31	105813
1995-03-31	103143
1995-06-30	114700
1995-09-30	109195
1995-12-31	111585
1996-03-31	109004
1996-06-30	112198
1996-09-30	120832
1996-12-31	141519
1997-03-31	155305
1997-06-30	167531
1997-09-30	165214
1997-12-31	192112
1998-03-31	204611
1998-06-30	194390
1998-09-30	207390
1998-12-31	205251
1999-03-31	202548
1999-06-30	190403
1999-09-30	198375
1999-12-31	184795
2000-03-31	213167
2000-06-30	205990
2000-09-30	216856
2000-12-31	212350
2001-03-31	224747
2001-06-30	202010
2001-09-30	232451
2001-12-31	230104
2002-03-31	230599
2002-06-30	237356
2002-09-30	234849
2002-12-31	250069
2003-03-31	252764
2003-06-30	281687
2003-09-30	279879
2003-12-31	316622
2004-03-31	385478
2004-06-30	380946
2004-09-30	323744
2004-12-31	351263
2005-03-31	399603
2005-06-30	383134
2005-09-30	390233
2005-12-31	422312
2006-03-31	462005
2006-06-30	543718
2006-09-30	534821
2006-12-31	626376
2007-03-31	806758
2007-06-30	824065
2007-09-30	851988
2007-12-31	915403
2008-03-31	930108
2008-06-30	833479
2008-09-30	765470
2008-12-31	623471
2009-03-31	647650
2009-06-30	676745
2009-09-30	558366
2009-12-31	551711
2010-03-31	540829
2010-06-30	526499
2010-09-30	565174
2010-12-31	530435
2011-03-31	511386
2011-06-30	503635
2011-09-30	503842
2011-12-31	456161
2012-03-31	493850
2012-06-30	479971
2012-09-30	492890
2012-12-31	459310
2013-03-31	405542
2013-06-30	417466
2013-09-30	422594
2013-12-31	441612
2014-03-31	466818
2014-06-30	474946
2014-09-30	455297
2014-12-31	435614
2015-03-31	430538
2015-06-30	466879
2015-09-30	463490
2015-12-31	438341