Quarter	US dollars
1986-09-30	38418
1986-12-31	41322
1987-03-31	45836
1987-06-30	41842
1987-09-30	39654
1987-12-31	46570
1988-03-31	42296
1988-06-30	36534
1988-09-30	37072
1988-12-31	36725
1989-03-31	32860
1989-06-30	32913
1989-09-30	33545
1989-12-31	34996
1990-03-31	38301
1990-06-30	39032
1990-09-30	46761
1990-12-31	44920
1991-03-31	40232
1991-06-30	39065
1991-09-30	37804
1991-12-31	39847
1992-03-31	36512
1992-06-30	39758
1992-09-30	47020
1992-12-31	39980
1993-03-31	33382
1993-06-30	30803
1993-09-30	31125
1993-12-31	30786
1994-03-31	30946
1994-06-30	33784
1994-09-30	35882
1994-12-31	35235
1995-03-31	40060
1995-06-30	42131
1995-09-30	40287
1995-12-31	36400
1996-03-31	38879
1996-06-30	36097
1996-09-30	40001
1996-12-31	37660
1997-03-31	38423
1997-06-30	40837
1997-09-30	42783
1997-12-31	49194
1998-03-31	46674
1998-06-30	46206
1998-09-30	53355
1998-12-31	55007
1999-03-31	52057
1999-06-30	51956
1999-09-30	52238
1999-12-31	46216
2000-03-31	54407
2000-06-30	51223
2000-09-30	47903
2000-12-31	50989
2001-03-31	50611
2001-06-30	43878
2001-09-30	49170
2001-12-31	45577
2002-03-31	44977
2002-06-30	46991
2002-09-30	46763
2002-12-31	45890
2003-03-31	49638
2003-06-30	51007
2003-09-30	50278
2003-12-31	50061
2004-03-31	52567
2004-06-30	49403
2004-09-30	49913
2004-12-31	47811
2005-03-31	50012
2005-06-30	52491
2005-09-30	47880
2005-12-31	48595
2006-03-31	59594
2006-06-30	57195
2006-09-30	51843
2006-12-31	52916
2007-03-31	54284
2007-06-30	61047
2007-09-30	71709
2007-12-31	73562
2008-03-31	84077
2008-06-30	80458
2008-09-30	72407
2008-12-31	67081
2009-03-31	66001
2009-06-30	66369
2009-09-30	61699
2009-12-31	64095
2010-03-31	58767
2010-06-30	65568
2010-09-30	76217
2010-12-31	85437
2011-03-31	93035
2011-06-30	105462
2011-09-30	137523
2011-12-31	154193
2012-03-31	116960
2012-06-30	129816
2012-09-30	146864
2012-12-31	141461
2013-03-31	147483
2013-06-30	116043
2013-09-30	121549
2013-12-31	132352
2014-03-31	123980
2014-06-30	111748
2014-09-30	124281
2014-12-31	104233
2015-03-31	105371
2015-06-30	97315
2015-09-30	94741
2015-12-31	91967