Quarter	US dollars
1986-09-30	9981
1986-12-31	8860
1987-03-31	12064
1987-06-30	11461
1987-09-30	12723
1987-12-31	16281
1988-03-31	17014
1988-06-30	16668
1988-09-30	18553
1988-12-31	18998
1989-03-31	21767
1989-06-30	20962
1989-09-30	21420
1989-12-31	18760
1990-03-31	21627
1990-06-30	23482
1990-09-30	22870
1990-12-31	20394
1991-03-31	17549
1991-06-30	14910
1991-09-30	15869
1991-12-31	15200
1992-03-31	13001
1992-06-30	14913
1992-09-30	14297
1992-12-31	12928
1993-03-31	13180
1993-06-30	14001
1993-09-30	12272
1993-12-31	11457
1994-03-31	12174
1994-06-30	15996
1994-09-30	18195
1994-12-31	19024
1995-03-31	21839
1995-06-30	24215
1995-09-30	26129
1995-12-31	27471
1996-03-31	28842
1996-06-30	27973
1996-09-30	32480
1996-12-31	32126
1997-03-31	25562
1997-06-30	23995
1997-09-30	30191
1997-12-31	28874
1998-03-31	30569
1998-06-30	27949
1998-09-30	23402
1998-12-31	16986