Quarter	US dollars
1986-12-31	11054
1987-03-31	12597
1987-06-30	25316
1987-09-30	30062
1987-12-31	19797
1988-03-31	1453
1988-06-30	18036
1988-09-30	28764
1988-12-31	-5128
1989-03-31	26932
1989-06-30	712
1989-09-30	18947
1989-12-31	12958
1990-03-31	24204
1990-06-30	3737
1990-09-30	46616
1990-12-31	15753
1991-03-31	-3429
1991-06-30	-30182
1991-09-30	-3876
1991-12-31	-6773
1992-03-31	-7783
1992-06-30	1368
1992-09-30	63032
1992-12-31	19966
1993-03-31	-12869
1993-06-30	-2341
1993-09-30	3110
1993-12-31	46557
1994-03-31	1114
1994-06-30	13046
1994-09-30	33843
1994-12-31	41632
1995-03-31	32790
1995-06-30	11326
1995-09-30	22347
1995-12-31	7042
1996-03-31	20289
1996-06-30	10023
1996-09-30	40349
1996-12-31	34300
1997-03-31	94971
1997-06-30	7077
1997-09-30	66958
1997-12-31	173955
1998-03-31	15721
1998-06-30	54154
1998-09-30	101527
1998-12-31	-79486