Quarter	US dollars
1986-09-30	4565
1986-12-31	4753
1987-03-31	5849
1987-06-30	5210
1987-09-30	5822
1987-12-31	9425
1988-03-31	10242
1988-06-30	10687
1988-09-30	10528
1988-12-31	12705
1989-03-31	14134
1989-06-30	11723
1989-09-30	12974
1989-12-31	11772
1990-03-31	12454
1990-06-30	15382
1990-09-30	15958
1990-12-31	17806
1991-03-31	13461
1991-06-30	12086
1991-09-30	11806
1991-12-31	12090
1992-03-31	10269
1992-06-30	10445
1992-09-30	13658
1992-12-31	8630
1993-03-31	10582
1993-06-30	8620
1993-09-30	10372
1993-12-31	13124
1994-03-31	7630
1994-06-30	10833
1994-09-30	12012
1994-12-31	11040
1995-03-31	9132
1995-06-30	13268
1995-09-30	12907
1995-12-31	14045
1996-03-31	8710
1996-06-30	12339
1996-09-30	10660
1996-12-31	9906
1997-03-31	12460
1997-06-30	9707
1997-09-30	8511
1997-12-31	12434
1998-03-31	10692
1998-06-30	10593
1998-09-30	11739
1998-12-31	12081
1999-03-31	8649
1999-06-30	8418
1999-09-30	8144
1999-12-31	8466
2000-03-31	9749
2000-06-30	8884
2000-09-30	11754
2000-12-31	10572
2001-03-31	12450
2001-06-30	12457
2001-09-30	11744
2001-12-31	11211
2002-03-31	10739
2002-06-30	12818
2002-09-30	14256
2002-12-31	15483
2003-03-31	19192
2003-06-30	22228
2003-09-30	24385
2003-12-31	29173
2004-03-31	34605
2004-06-30	37798
2004-09-30	42839
2004-12-31	43433
2005-03-31	50766
2005-06-30	50365
2005-09-30	54690
2005-12-31	78808
2006-03-31	93095
2006-06-30	87374
2006-09-30	71698
2006-12-31	83667
2007-03-31	89553
2007-06-30	75257
2007-09-30	83419
2007-12-31	110924
2008-03-31	106495
2008-06-30	96780
2008-09-30	98174
2008-12-31	42272
2009-03-31	42951
2009-06-30	47742
2009-09-30	51742
2009-12-31	49247
2010-03-31	48744
2010-06-30	45648
2010-09-30	43184
2010-12-31	48377
2011-03-31	57067
2011-06-30	53263
2011-09-30	47802
2011-12-31	47252
2012-03-31	61880
2012-06-30	48470
2012-09-30	60042
2012-12-31	51771
2013-03-31	52904
2013-06-30	51999
2013-09-30	56371
2013-12-31	77053
2014-03-31	87496
2014-06-30	88545
2014-09-30	76532
2014-12-31	79431
2015-03-31	68271
2015-06-30	75965
2015-09-30	72369
2015-12-31	75000