Quarter	US dollars
1986-09-30	20249
1986-12-31	21512
1987-03-31	23763
1987-06-30	23357
1987-09-30	22767
1987-12-31	26304
1988-03-31	25867
1988-06-30	26019
1988-09-30	25165
1988-12-31	28092
1989-03-31	25637
1989-06-30	27598
1989-09-30	30968
1989-12-31	34194
1990-03-31	36726
1990-06-30	41240
1990-09-30	51346
1990-12-31	54624
1991-03-31	55111
1991-06-30	55122
1991-09-30	64138
1991-12-31	62464
1992-03-31	60919
1992-06-30	68363
1992-09-30	68785
1992-12-31	71578
1993-03-31	80828
1993-06-30	76924
1993-09-30	82112
1993-12-31	85081
1994-03-31	82623
1994-06-30	79776
1994-09-30	77671
1994-12-31	83727
1995-03-31	88331
1995-06-30	97383
1995-09-30	98722
1995-12-31	109863
1996-03-31	116990
1996-06-30	121036
1996-09-30	123563
1996-12-31	121909
1997-03-31	122396
1997-06-30	121253
1997-09-30	125949
1997-12-31	134942
1998-03-31	155507
1998-06-30	185390
1998-09-30	194263
1998-12-31	167511
1999-03-31	38941
1999-06-30	34376
1999-09-30	37459
1999-12-31	35991
2000-03-31	37289
2000-06-30	37721
2000-09-30	42843
2000-12-31	39902
2001-03-31	37853
2001-06-30	37899
2001-09-30	37341
2001-12-31	36014
2002-03-31	39150
2002-06-30	38823
2002-09-30	40319
2002-12-31	39062
2003-03-31	37818
2003-06-30	39253
2003-09-30	42045
2003-12-31	46070
2004-03-31	59905
2004-06-30	53554
2004-09-30	55368
2004-12-31	61802
2005-03-31	64097
2005-06-30	69837
2005-09-30	69913
2005-12-31	73312
2006-03-31	81945
2006-06-30	85190
2006-09-30	93308
2006-12-31	100707
2007-03-31	119131
2007-06-30	135888
2007-09-30	134206
2007-12-31	142714
2008-03-31	137935
2008-06-30	135503
2008-09-30	114686
2008-12-31	90046
2009-03-31	80709
2009-06-30	90946
2009-09-30	97860
2009-12-31	101711
2010-03-31	113828
2010-06-30	98890
2010-09-30	115660
2010-12-31	124217
2011-03-31	128054
2011-06-30	132071
2011-09-30	131177
2011-12-31	110966
2012-03-31	125053
2012-06-30	119923
2012-09-30	134881
2012-12-31	135754
2013-03-31	134166
2013-06-30	117995
2013-09-30	121110
2013-12-31	113270
2014-03-31	110199
2014-06-30	113719
2014-09-30	106669
2014-12-31	97173
2015-03-31	94560
2015-06-30	97001
2015-09-30	92645
2015-12-31	99240