Quarter	US dollars
1986-09-30	55910
1986-12-31	59551
1987-03-31	69046
1987-06-30	71791
1987-09-30	76881
1987-12-31	93068
1988-03-31	99544
1988-06-30	104888
1988-09-30	108112
1988-12-31	114760
1989-03-31	113078
1989-06-30	109079
1989-09-30	122174
1989-12-31	121441
1990-03-31	132821
1990-06-30	147229
1990-09-30	162892
1990-12-31	176463
1991-03-31	159722
1991-06-30	141942
1991-09-30	149028
1991-12-31	151957
1992-03-31	143123
1992-06-30	157429
1992-09-30	158170
1992-12-31	128385
1993-03-31	129865
1993-06-30	124382
1993-09-30	123895
1993-12-31	126036
1994-03-31	117934
1994-06-30	120641
1994-09-30	136675
1994-12-31	140667
1995-03-31	148362
1995-06-30	155512
1995-09-30	152271
1995-12-31	152083
1996-03-31	145373
1996-06-30	143044
1996-09-30	144978
1996-12-31	165119
1997-03-31	168019
1997-06-30	174141
1997-09-30	207300
1997-12-31	231765
1998-03-31	229410
1998-06-30	238092
1998-09-30	259500
1998-12-31	258882
1999-03-31	263722
1999-06-30	267826
1999-09-30	293872
1999-12-31	290502
2000-03-31	306022
2000-06-30	298037
2000-09-30	302081
2000-12-31	318918
2001-03-31	332022
2001-06-30	309758
2001-09-30	328840
2001-12-31	336152
2002-03-31	330643
2002-06-30	352673
2002-09-30	371125
2002-12-31	387710
2003-03-31	391058
2003-06-30	421127
2003-09-30	435020
2003-12-31	468537
2004-03-31	530979
2004-06-30	532850
2004-09-30	518575
2004-12-31	572183
2005-03-31	586744
2005-06-30	570705
2005-09-30	590081
2005-12-31	603903
2006-03-31	635438
2006-06-30	728253
2006-09-30	720991
2006-12-31	798694
2007-03-31	989802
2007-06-30	1011444
2007-09-30	1128942
2007-12-31	1267884
2008-03-31	1298096
2008-06-30	1232557
2008-09-30	1142623
2008-12-31	863343
2009-03-31	897901
2009-06-30	985895
2009-09-30	905204
2009-12-31	876258
2010-03-31	841735
2010-06-30	825075
2010-09-30	865943
2010-12-31	818605
2011-03-31	780961
2011-06-30	789366
2011-09-30	741844
2011-12-31	704638
2012-03-31	777263
2012-06-30	760092
2012-09-30	814601
2012-12-31	809661
2013-03-31	724120
2013-06-30	718600
2013-09-30	745013
2013-12-31	767445
2014-03-31	759073
2014-06-30	771919
2014-09-30	715626
2014-12-31	704155
2015-03-31	674209
2015-06-30	725455
2015-09-30	732586
2015-12-31	709505