Quarterly US dollars
1986-09-30 5634
1986-12-31 4808
1987-03-31 5365
1987-06-30 8170
1987-09-30 8618
1987-12-31 12652
1988-03-31 12838
1988-06-30 14480
1988-09-30 13798
1988-12-31 13737
1989-03-31 12714
1989-06-30 12531
1989-09-30 12734
1989-12-31 12290
1990-03-31 13138
1990-06-30 13185
1990-09-30 13794
1990-12-31 14058
1991-03-31 11582
1991-06-30 9931
1991-09-30 10085
1991-12-31 9739
1992-03-31 7694
1992-06-30 7299
1992-09-30 7498
1992-12-31 6167
1993-03-31 6720
1993-06-30 7027
1993-09-30 7804
1993-12-31 7032
1994-03-31 7271
1994-06-30 6336
1994-09-30 6587
1994-12-31 8901
1995-03-31 9120
1995-06-30 10249
1995-09-30 8059
1995-12-31 6851
1996-03-31 7039
1996-06-30 8195
1996-09-30 8200
1996-12-31 6713
1997-03-31 8282
1997-06-30 6901
1997-09-30 9156
1997-12-31 7624
1998-03-31 8993
1998-06-30 7911
1998-09-30 7858
1998-12-31 4322
1999-03-31 2584
1999-06-30 2420
1999-09-30 2321
1999-12-31 5053
2000-03-31 2937
2000-06-30 2189
2000-09-30 3885
2000-12-31 5736
2001-03-31 5044
2001-06-30 3295
2001-09-30 2808
2001-12-31 1841
2002-03-31 1839
2002-06-30 1258
2002-09-30 940
2002-12-31 559
2003-03-31 675
2003-06-30 663
2003-09-30 808
2003-12-31 709
2004-03-31 1655
2004-06-30 2107
2004-09-30 971
2004-12-31 1732
2005-03-31 3771
2005-06-30 2152
2005-09-30 3010
2005-12-31 3548
2006-03-31 2339
2006-06-30 5685
2006-09-30 3923
2006-12-31 4440
2007-03-31 5174
2007-06-30 5043
2007-09-30 5140
2007-12-31 15630
2008-03-31 15397
2008-06-30 11158
2008-09-30 10696
2008-12-31 8463
2009-03-31 5006
2009-06-30 4714
2009-09-30 7476
2009-12-31 9680
2010-03-31 8588
2010-06-30 4285
2010-09-30 9347
2010-12-31 10330
2011-03-31 5681
2011-06-30 7835
2011-09-30 2710
2011-12-31 1544
2012-03-31 3038
2012-06-30 1924
2012-09-30 3627
2012-12-31 4284
2013-03-31 7555
2013-06-30 4064
2013-09-30 3934
2013-12-31 3000
2014-03-31 2213
2014-06-30 3455
2014-09-30 1923
2014-12-31 4446
2015-03-31 4477
2015-06-30 11728
2015-09-30 4403
2015-12-31 4490