Quarterly US dollars
1986-09-30 11444
1986-12-31 12914
1987-03-31 13097
1987-06-30 13991
1987-09-30 15032
1987-12-31 17094
1988-03-31 17583
1988-06-30 18752
1988-09-30 18901
1988-12-31 21455
1989-03-31 21273
1989-06-30 22132
1989-09-30 24123
1989-12-31 25644
1990-03-31 31169
1990-06-30 33169
1990-09-30 38326
1990-12-31 37321
1991-03-31 36865
1991-06-30 37685
1991-09-30 40238
1991-12-31 35024
1992-03-31 34168
1992-06-30 38924
1992-09-30 43295
1992-12-31 35743
1993-03-31 39845
1993-06-30 36773
1993-09-30 36626
1993-12-31 35500
1994-03-31 40336
1994-06-30 41256
1994-09-30 43568
1994-12-31 40477
1995-03-31 41506
1995-06-30 40860
1995-09-30 42442
1995-12-31 49538
1996-03-31 61918
1996-06-30 61460
1996-09-30 64678
1996-12-31 62178
1997-03-31 68211
1997-06-30 67129
1997-09-30 81941
1997-12-31 78444
1998-03-31 90509
1998-06-30 97307
1998-09-30 112986
1998-12-31 90560
1999-03-31 20046
1999-06-30 18443
1999-09-30 17576
1999-12-31 16242
2000-03-31 17877
2000-06-30 19244
2000-09-30 20909
2000-12-31 19554
2001-03-31 18598
2001-06-30 23313
2001-09-30 21490
2001-12-31 20971
2002-03-31 22868
2002-06-30 24260
2002-09-30 25996
2002-12-31 29370
2003-03-31 28598
2003-06-30 30673
2003-09-30 33164
2003-12-31 36452
2004-03-31 40888
2004-06-30 39584
2004-09-30 43566
2004-12-31 47109
2005-03-31 46778
2005-06-30 52783
2005-09-30 59208
2005-12-31 55858
2006-03-31 67421
2006-06-30 70000
2006-09-30 69857
2006-12-31 70165
2007-03-31 78229
2007-06-30 80721
2007-09-30 88924
2007-12-31 91243
2008-03-31 93051
2008-06-30 92785
2008-09-30 87901
2008-12-31 69801
2009-03-31 72144
2009-06-30 75973
2009-09-30 91260
2009-12-31 91339
2010-03-31 94955
2010-06-30 82633
2010-09-30 88855
2010-12-31 86376
2011-03-31 99947
2011-06-30 104245
2011-09-30 93303
2011-12-31 87049
2012-03-31 87109
2012-06-30 86889
2012-09-30 92002
2012-12-31 91522
2013-03-31 91711
2013-06-30 94423
2013-09-30 95467
2013-12-31 89072
2014-03-31 91880
2014-06-30 95483
2014-09-30 94189
2014-12-31 85160
2015-03-31 81106
2015-06-30 85025
2015-09-30 85933
2015-12-31 77590