Quarter	US dollars
1986-09-30	24393
1986-12-31	27023
1987-03-31	28158
1987-06-30	27760
1987-09-30	28422
1987-12-31	33943
1988-03-31	35623
1988-06-30	32078
1988-09-30	29626
1988-12-31	30972
1989-03-31	30418
1989-06-30	26668
1989-09-30	29300
1989-12-31	30811
1990-03-31	31531
1990-06-30	33923
1990-09-30	36891
1990-12-31	38246
1991-03-31	36393
1991-06-30	33705
1991-09-30	36672
1991-12-31	36308
1992-03-31	33917
1992-06-30	37817
1992-09-30	37511
1992-12-31	31448
1993-03-31	32045
1993-06-30	31798
1993-09-30	32169
1993-12-31	31619
1994-03-31	32662
1994-06-30	32419
1994-09-30	31706
1994-12-31	30704
1995-03-31	31050
1995-06-30	29408
1995-09-30	29390
1995-12-31	29611
1996-03-31	33588
1996-06-30	34452
1996-09-30	36254
1996-12-31	42686
1997-03-31	44235
1997-06-30	46938
1997-09-30	46519
1997-12-31	52298
1998-03-31	57564
1998-06-30	52532
1998-09-30	52217
1998-12-31	45975
1999-03-31	46721
1999-06-30	45308
1999-09-30	47716
1999-12-31	46802
2000-03-31	49943
2000-06-30	46596
2000-09-30	51955
2000-12-31	49470
2001-03-31	52476
2001-06-30	52303
2001-09-30	54115
2001-12-31	56463
2002-03-31	64486
2002-06-30	63291
2002-09-30	61585
2002-12-31	69462
2003-03-31	75012
2003-06-30	81857
2003-09-30	79781
2003-12-31	85029
2004-03-31	98779
2004-06-30	101089
2004-09-30	91911
2004-12-31	112813
2005-03-31	130021
2005-06-30	119784
2005-09-30	125365
2005-12-31	128962
2006-03-31	147852
2006-06-30	171439
2006-09-30	178132
2006-12-31	202739
2007-03-31	210174
2007-06-30	221120
2007-09-30	241072
2007-12-31	246822
2008-03-31	251158
2008-06-30	240232
2008-09-30	237222
2008-12-31	175847
2009-03-31	181646
2009-06-30	184992
2009-09-30	179397
2009-12-31	179188
2010-03-31	179191
2010-06-30	168262
2010-09-30	204513
2010-12-31	213357
2011-03-31	226163
2011-06-30	215281
2011-09-30	224851
2011-12-31	220213
2012-03-31	238435
2012-06-30	239073
2012-09-30	236112
2012-12-31	215999
2013-03-31	188884
2013-06-30	193722
2013-09-30	190949
2013-12-31	214264
2014-03-31	249607
2014-06-30	258145
2014-09-30	243853
2014-12-31	235858
2015-03-31	231171
2015-06-30	246915
2015-09-30	243456
2015-12-31	234859