Quarterly US dollars
1986-09-30 16157
1986-12-31 17223
1987-03-31 17060
1987-06-30 18082
1987-09-30 18397
1987-12-31 19505
1988-03-31 19082
1988-06-30 20296
1988-09-30 19719
1988-12-31 21425
1989-03-31 20568
1989-06-30 20864
1989-09-30 20283
1989-12-31 21141
1990-03-31 20048
1990-06-30 18624
1990-09-30 19354
1990-12-31 18256
1991-03-31 18737
1991-06-30 15328
1991-09-30 15895
1991-12-31 16722
1992-03-31 14216
1992-06-30 14003
1992-09-30 22091
1992-12-31 14611
1993-03-31 16643
1993-06-30 14625
1993-09-30 17206
1993-12-31 22440
1994-03-31 10567
1994-06-30 13044
1994-09-30 14239
1994-12-31 11813
1995-03-31 6828
1995-06-30 14001
1995-09-30 14732
1995-12-31 13235
1996-03-31 4934
1996-06-30 8226
1996-09-30 6705
1996-12-31 5772
1997-03-31 7979
1997-06-30 5754
1997-09-30 4495
1997-12-31 4613
1998-03-31 4644
1998-06-30 6668
1998-09-30 5872
1998-12-31 3743
1999-03-31 70933
1999-06-30 127958
1999-09-30 52273
1999-12-31 13812
2000-03-31 34905
2000-06-30 39344
2000-09-30 32220
2000-12-31 9483
2001-03-31 7992
2001-06-30 10232
2001-09-30 11162
2001-12-31 10962
2002-03-31 11067
2002-06-30 11728
2002-09-30 16277
2002-12-31 14847
2003-03-31 20192
2003-06-30 20796
2003-09-30 29285
2003-12-31 25172
2004-03-31 32589
2004-06-30 34284
2004-09-30 45758
2004-12-31 38860
2005-03-31 63501
2005-06-30 52652
2005-09-30 62935
2005-12-31 59309
2006-03-31 68330
2006-06-30 68354
2006-09-30 79255
2006-12-31 64469
2007-03-31 85019
2007-06-30 95535
2007-09-30 106008
2007-12-31 92024
2008-03-31 83904
2008-06-30 71765
2008-09-30 64012
2008-12-31 39922
2009-03-31 45881
2009-06-30 59275
2009-09-30 39832
2009-12-31 32445
2010-03-31 46548
2010-06-30 49756
2010-09-30 49473
2010-12-31 48660
2011-03-31 57328
2011-06-30 38114
2011-09-30 41678
2011-12-31 27913
2012-03-31 29430
2012-06-30 17113
2012-09-30 26413
2012-12-31 27082
2013-03-31 47883
2013-06-30 45037
2013-09-30 28838
2013-12-31 39796
2014-03-31 37692
2014-06-30 33627
2014-09-30 27745
2014-12-31 32538
2015-03-31 30690
2015-06-30 41846
2015-09-30 52727
2015-12-31 56423