Quarter	US dollars
1986-12-31	15257
1987-03-31	9887
1987-06-30	22530
1987-09-30	18081
1987-12-31	2606
1988-03-31	12852
1988-06-30	14087
1988-09-30	24562
1988-12-31	-721
1989-03-31	35398
1989-06-30	-3641
1989-09-30	5927
1989-12-31	12509
1990-03-31	-357
1990-06-30	-8968
1990-09-30	27688
1990-12-31	44572
1991-03-31	-21854
1991-06-30	-48115
1991-09-30	6528
1991-12-31	14998
1992-03-31	-32683
1992-06-30	-17151
1992-09-30	52203
1992-12-31	70667
1993-03-31	4179
1993-06-30	-9505
1993-09-30	-3840
1993-12-31	34394
1994-03-31	-16760
1994-06-30	772
1994-09-30	24190
1994-12-31	40485
1995-03-31	29913
1995-06-30	6329
1995-09-30	15512
1995-12-31	-10858
1996-03-31	9315
1996-06-30	395
1996-09-30	24252
1996-12-31	32738
1997-03-31	65266
1997-06-30	-7298
1997-09-30	34424
1997-12-31	108536
1998-03-31	5338
1998-06-30	16806
1998-09-30	67358
1998-12-31	-71492