Quarter	US dollars
1986-09-30	74667
1986-12-31	80522
1987-03-31	87655
1987-06-30	88156
1987-09-30	88373
1987-12-31	103182
1988-03-31	102257
1988-06-30	98663
1988-09-30	98006
1988-12-31	104947
1989-03-31	102832
1989-06-30	107906
1989-09-30	114863
1989-12-31	121446
1990-03-31	138024
1990-06-30	146699
1990-09-30	169737
1990-12-31	172747
1991-03-31	166239
1991-06-30	162602
1991-09-30	172520
1991-12-31	168026
1992-03-31	162933
1992-06-30	177740
1992-09-30	202300
1992-12-31	196974
1993-03-31	215016
1993-06-30	209284
1993-09-30	221881
1993-12-31	219437
1994-03-31	224295
1994-06-30	236104
1994-09-30	242636
1994-12-31	240175
1995-03-31	276719
1995-06-30	284000
1995-09-30	278720
1995-12-31	303920
1996-03-31	315308
1996-06-30	324116
1996-09-30	348393
1996-12-31	349732
1997-03-31	341304
1997-06-30	340642
1997-09-30	357568
1997-12-31	369779
1998-03-31	401346
1998-06-30	433384
1998-09-30	490130
1998-12-31	429589
1999-03-31	94143
1999-06-30	87608
1999-09-30	91182
1999-12-31	89041
2000-03-31	92427
2000-06-30	95652
2000-09-30	99799
2000-12-31	100689
2001-03-31	94429
2001-06-30	100153
2001-09-30	103691
2001-12-31	102399
2002-03-31	111380
2002-06-30	115117
2002-09-30	123229
2002-12-31	125662
2003-03-31	124848
2003-06-30	143274
2003-09-30	145477
2003-12-31	151152
2004-03-31	175558
2004-06-30	171351
2004-09-30	186190
2004-12-31	177812
2005-03-31	186716
2005-06-30	201606
2005-09-30	206508
2005-12-31	202208
2006-03-31	231824
2006-06-30	248743
2006-09-30	264962
2006-12-31	259375
2007-03-31	300845
2007-06-30	317857
2007-09-30	339638
2007-12-31	330383
2008-03-31	372797
2008-06-30	355505
2008-09-30	329187
2008-12-31	261081
2009-03-31	246038
2009-06-30	249358
2009-09-30	264378
2009-12-31	250661
2010-03-31	268577
2010-06-30	252399
2010-09-30	264814
2010-12-31	272030
2011-03-31	281768
2011-06-30	283610
2011-09-30	304042
2011-12-31	277709
2012-03-31	279088
2012-06-30	290181
2012-09-30	310748
2012-12-31	309718
2013-03-31	302592
2013-06-30	280689
2013-09-30	297666
2013-12-31	290172
2014-03-31	294540
2014-06-30	300016
2014-09-30	289958
2014-12-31	271407
2015-03-31	277081
2015-06-30	272365
2015-09-30	262132
2015-12-31	255900