Quarter	US dollars
1986-09-30	60817
1986-12-31	59332
1987-03-31	65285
1987-06-30	72039
1987-09-30	76630
1987-12-31	88600
1988-03-31	83763
1988-06-30	85000
1988-09-30	85531
1988-12-31	91244
1989-03-31	94632
1989-06-30	95217
1989-09-30	99867
1989-12-31	95901
1990-03-31	95951
1990-06-30	101673
1990-09-30	105872
1990-12-31	105248
1991-03-31	91142
1991-06-30	91425
1991-09-30	94200
1991-12-31	94822
1992-03-31	87685
1992-06-30	93894
1992-09-30	90879
1992-12-31	86990
1993-03-31	83175
1993-06-30	85111
1993-09-30	86652
1993-12-31	94870
1994-03-31	99064
1994-06-30	106154
1994-09-30	116079
1994-12-31	117840
1995-03-31	121796
1995-06-30	124887
1995-09-30	120681
1995-12-31	121578
1996-03-31	125148
1996-06-30	126293
1996-09-30	131478
1996-12-31	130255
1997-03-31	139944
1997-06-30	130021
1997-09-30	124813
1997-12-31	122325
1998-03-31	135144
1998-06-30	130693
1998-09-30	124531
1998-12-31	111810
1999-03-31	157330
1999-06-30	221095
1999-09-30	153921
1999-12-31	125362
2000-03-31	141611
2000-06-30	150013
2000-09-30	146501
2000-12-31	132015
2001-03-31	142501
2001-06-30	135873
2001-09-30	139097
2001-12-31	129372
2002-03-31	122465
2002-06-30	128727
2002-09-30	137293
2002-12-31	154576
2003-03-31	169193
2003-06-30	174658
2003-09-30	195518
2003-12-31	211808
2004-03-31	238096
2004-06-30	249203
2004-09-30	266076
2004-12-31	270756
2005-03-31	313919
2005-06-30	303633
2005-09-30	337411
2005-12-31	374202
2006-03-31	402009
2006-06-30	420818
2006-09-30	427653
2006-12-31	435972
2007-03-31	495618
2007-06-30	471713
2007-09-30	544640
2007-12-31	591710
2008-03-31	584133
2008-06-30	480938
2008-09-30	525685
2008-12-31	324235
2009-03-31	263969
2009-06-30	244875
2009-09-30	257016
2009-12-31	261836
2010-03-31	269543
2010-06-30	272711
2010-09-30	255814
2010-12-31	284374
2011-03-31	299610
2011-06-30	283996
2011-09-30	296099
2011-12-31	283215
2012-03-31	316584
2012-06-30	297156
2012-09-30	283858
2012-12-31	282560
2013-03-31	297703
2013-06-30	279347
2013-09-30	317012
2013-12-31	357348
2014-03-31	362074
2014-06-30	361413
2014-09-30	337559
2014-12-31	329706
2015-03-31	296629
2015-06-30	317323
2015-09-30	334164
2015-12-31	316810