Quarter	US dollars
1986-09-30	56914
1986-12-31	59314
1987-03-31	66890
1987-06-30	63336
1987-09-30	61315
1987-12-31	72887
1988-03-31	70969
1988-06-30	64646
1988-09-30	64990
1988-12-31	64844
1989-03-31	66425
1989-06-30	67864
1989-09-30	70678
1989-12-31	77441
1990-03-31	90447
1990-06-30	93546
1990-09-30	105525
1990-12-31	106128
1991-03-31	101036
1991-06-30	97998
1991-09-30	102299
1991-12-31	107573
1992-03-31	102691
1992-06-30	112663
1992-09-30	123511
1992-12-31	112326
1993-03-31	114946
1993-06-30	112140
1993-09-30	117702
1993-12-31	115208
1994-03-31	120445
1994-06-30	130076
1994-09-30	138259
1994-12-31	135042
1995-03-31	154674
1995-06-30	155808
1995-09-30	150086
1995-12-31	155775
1996-03-31	171608
1996-06-30	174977
1996-09-30	196522
1996-12-31	202050
1997-03-31	210821
1997-06-30	203109
1997-09-30	228388
1997-12-31	232696
1998-03-31	249478
1998-06-30	260332
1998-09-30	310889
1998-12-31	282985
1999-03-31	56070
1999-06-30	59246
1999-09-30	67635
1999-12-31	74339
2000-03-31	65403
2000-06-30	67583
2000-09-30	57874
2000-12-31	66889
2001-03-31	58587
2001-06-30	57761
2001-09-30	65119
2001-12-31	66421
2002-03-31	74316
2002-06-30	84349
2002-09-30	84020
2002-12-31	92476
2003-03-31	93611
2003-06-30	109394
2003-09-30	103623
2003-12-31	116510
2004-03-31	134725
2004-06-30	119456
2004-09-30	132665
2004-12-31	131511
2005-03-31	136985
2005-06-30	139095
2005-09-30	146587
2005-12-31	148621
2006-03-31	172028
2006-06-30	183479
2006-09-30	196945
2006-12-31	195871
2007-03-31	211464
2007-06-30	216566
2007-09-30	232427
2007-12-31	223888
2008-03-31	251055
2008-06-30	234317
2008-09-30	218157
2008-12-31	179444
2009-03-31	175823
2009-06-30	185861
2009-09-30	201896
2009-12-31	207500
2010-03-31	207579
2010-06-30	210645
2010-09-30	212183
2010-12-31	228466
2011-03-31	243168
2011-06-30	257254
2011-09-30	241593
2011-12-31	233405
2012-03-31	219230
2012-06-30	209900
2012-09-30	213952
2012-12-31	228992
2013-03-31	230888
2013-06-30	207632
2013-09-30	217034
2013-12-31	225646
2014-03-31	234678
2014-06-30	241758
2014-09-30	220715
2014-12-31	205055
2015-03-31	204314
2015-06-30	200841
2015-09-30	188368
2015-12-31	177223