Quarter	US dollars
1986-09-30	57322
1986-12-31	62620
1987-03-31	69882
1987-06-30	68875
1987-09-30	68233
1987-12-31	79718
1988-03-31	78084
1988-06-30	73358
1988-09-30	72380
1988-12-31	76005
1989-03-31	74220
1989-06-30	78188
1989-09-30	82030
1989-12-31	85825
1990-03-31	96483
1990-06-30	101837
1990-09-30	118003
1990-12-31	122218
1991-03-31	118367
1991-06-30	114442
1991-09-30	121578
1991-12-31	121335
1992-03-31	119321
1992-06-30	127580
1992-09-30	149418
1992-12-31	153170
1993-03-31	167639
1993-06-30	164195
1993-09-30	176509
1993-12-31	175252
1994-03-31	174694
1994-06-30	184529
1994-09-30	188366
1994-12-31	188916
1995-03-31	223238
1995-06-30	230725
1995-09-30	224413
1995-12-31	242365
1996-03-31	242414
1996-06-30	250872
1996-09-30	268594
1996-12-31	273834
1997-03-31	260233
1997-06-30	260936
1997-09-30	264622
1997-12-31	277620
1998-03-31	294409
1998-06-30	319226
1998-09-30	359421
1998-12-31	323395
1999-03-31	65304
1999-06-30	59777
1999-09-30	62764
1999-12-31	62187
2000-03-31	63282
2000-06-30	66162
2000-09-30	71302
2000-12-31	70024
2001-03-31	69138
2001-06-30	65790
2001-09-30	70931
2001-12-31	69832
2002-03-31	75957
2002-06-30	76895
2002-09-30	82158
2002-12-31	79604
2003-03-31	80606
2003-06-30	94751
2003-09-30	94776
2003-12-31	95562
2004-03-31	115406
2004-06-30	112409
2004-09-30	122842
2004-12-31	108152
2005-03-31	115916
2005-06-30	121749
2005-09-30	119442
2005-12-31	118826
2006-03-31	137323
2006-06-30	148297
2006-09-30	164846
2006-12-31	149884
2007-03-31	178492
2007-06-30	191269
2007-09-30	200888
2007-12-31	177644
2008-03-31	219524
2008-06-30	210163
2008-09-30	201992
2008-12-31	135352
2009-03-31	135304
2009-06-30	143334
2009-09-30	148559
2009-12-31	134829
2010-03-31	144179
2010-06-30	125221
2010-09-30	130304
2010-12-31	134921
2011-03-31	130228
2011-06-30	130763
2011-09-30	158252
2011-12-31	141730
2012-03-31	146177
2012-06-30	151811
2012-09-30	157268
2012-12-31	153646
2013-03-31	145229
2013-06-30	120225
2013-09-30	126476
2013-12-31	122672
2014-03-31	118301
2014-06-30	121855
2014-09-30	126080
2014-12-31	114132
2015-03-31	127469
2015-06-30	117015
2015-09-30	107190
2015-12-31	116374