Quarter	US dollars
1986-09-30	468816
1986-12-31	481968
1987-03-31	509052
1987-06-30	527714
1987-09-30	538747
1987-12-31	580693
1988-03-31	580177
1988-06-30	566499
1988-09-30	584788
1988-12-31	597867
1989-03-31	601990
1989-06-30	577776
1989-09-30	615785
1989-12-31	640523
1990-03-31	645656
1990-06-30	648184
1990-09-30	694410
1990-12-31	739777
1991-03-31	695939
1991-06-30	650907
1991-09-30	670992
1991-12-31	685294
1992-03-31	640577
1992-06-30	660009
1992-09-30	717395
1992-12-31	705390
1993-03-31	706073
1993-06-30	693492
1993-09-30	706758
1993-12-31	729452
1994-03-31	733454
1994-06-30	750754
1994-09-30	785760
1994-12-31	835140
1995-03-31	930359
1995-06-30	925171
1995-09-30	919093
1995-12-31	947717
1996-03-31	926348
1996-06-30	925326
1996-09-30	946225
1996-12-31	1001328
1997-03-31	986619
1997-06-30	1005774
1997-09-30	1035169
1997-12-31	1164089
1998-03-31	1133207
1998-06-30	1183883
1998-09-30	1297923
1998-12-31	1314228
1999-03-31	1213449
1999-06-30	1172670
1999-09-30	1250026
1999-12-31	1229869
2000-03-31	1323645
2000-06-30	1351241
2000-09-30	1353629
2000-12-31	1482535
2001-03-31	1545313
2001-06-30	1469277
2001-09-30	1535163
2001-12-31	1571506
2002-03-31	1527257
2002-06-30	1632446
2002-09-30	1638102
2002-12-31	1776865
2003-03-31	1856048
2003-06-30	2011213
2003-09-30	1933255
2003-12-31	2068602
2004-03-31	2288508
2004-06-30	2284313
2004-09-30	2331497
2004-12-31	2486040
2005-03-31	2544164
2005-06-30	2562705
2005-09-30	2584599
2005-12-31	2530409
2006-03-31	2811129
2006-06-30	2930783
2006-09-30	2992257
2006-12-31	3155352
2007-03-31	3600889
2007-06-30	3690689
2007-09-30	4003963
2007-12-31	4244388
2008-03-31	4713898
2008-06-30	4056726
2008-09-30	3893504
2008-12-31	3638314
2009-03-31	3506267
2009-06-30	3544008
2009-09-30	3466154
2009-12-31	3388349
2010-03-31	3259936
2010-06-30	3042103
2010-09-30	3236648
2010-12-31	3107361
2011-03-31	3103359
2011-06-30	3055729
2011-09-30	3356262
2011-12-31	3266178
2012-03-31	3274813
2012-06-30	2980542
2012-09-30	3059421
2012-12-31	3030092
2013-03-31	2817432
2013-06-30	2662793
2013-09-30	2582728
2013-12-31	2592145
2014-03-31	2559695
2014-06-30	2611631
2014-09-30	2506043
2014-12-31	2419514
2015-03-31	2332671
2015-06-30	2246227
2015-09-30	2174077
2015-12-31	2159777