Quarter	US dollars
1986-09-30	52310
1986-12-31	52730
1987-03-31	61332
1987-06-30	66155
1987-09-30	71192
1987-12-31	88689
1988-03-31	90392
1988-06-30	86003
1988-09-30	90804
1988-12-31	86563
1989-03-31	89314
1989-06-30	83531
1989-09-30	90078
1989-12-31	90312
1990-03-31	85704
1990-06-30	84128
1990-09-30	89451
1990-12-31	92754
1991-03-31	79886
1991-06-30	80732
1991-09-30	84555
1991-12-31	83407
1992-03-31	76346
1992-06-30	75135
1992-09-30	73807
1992-12-31	69646
1993-03-31	75099
1993-06-30	74264
1993-09-30	78295
1993-12-31	75388
1994-03-31	87048
1994-06-30	86915
1994-09-30	96091
1994-12-31	92305
1995-03-31	121369
1995-06-30	108959
1995-09-30	114034
1995-12-31	118742
1996-03-31	113417
1996-06-30	122498
1996-09-30	115900
1996-12-31	126237
1997-03-31	131198
1997-06-30	142910
1997-09-30	145175
1997-12-31	186238
1998-03-31	164042
1998-06-30	174112
1998-09-30	209860
1998-12-31	221658
1999-03-31	168719
1999-06-30	159264
1999-09-30	189090
1999-12-31	199525
2000-03-31	222417
2000-06-30	221572
2000-09-30	220555
2000-12-31	222119
2001-03-31	185092
2001-06-30	195757
2001-09-30	170521
2001-12-31	163628
2002-03-31	161798
2002-06-30	169044
2002-09-30	181789
2002-12-31	183047
2003-03-31	181896
2003-06-30	164759
2003-09-30	181850
2003-12-31	171642
2004-03-31	177877
2004-06-30	186577
2004-09-30	209238
2004-12-31	237340
2005-03-31	217184
2005-06-30	226125
2005-09-30	207188
2005-12-31	219569
2006-03-31	206610
2006-06-30	202289
2006-09-30	192909
2006-12-31	213220
2007-03-31	230426
2007-06-30	239358
2007-09-30	296904
2007-12-31	347164
2008-03-31	451945
2008-06-30	340160
2008-09-30	350227
2008-12-31	292116
2009-03-31	212225
2009-06-30	253005
2009-09-30	254765
2009-12-31	198888
2010-03-31	189345
2010-06-30	192377
2010-09-30	189204
2010-12-31	192470
2011-03-31	189791
2011-06-30	191478
2011-09-30	209821
2011-12-31	223818
2012-03-31	201996
2012-06-30	203500
2012-09-30	204283
2012-12-31	190266
2013-03-31	188904
2013-06-30	174984
2013-09-30	181888
2013-12-31	177167
2014-03-31	162523
2014-06-30	170554
2014-09-30	159873
2014-12-31	165624
2015-03-31	146553
2015-06-30	127863
2015-09-30	121835
2015-12-31	138950