Bi-annual	US dollars
1987-06-30	42
1987-12-31	57
1988-06-30	38
1988-12-31	49
1989-06-30	53
1989-12-31	48
1990-06-30	30
1990-12-31	52
1991-06-30	84
1991-12-31	35
1992-06-30	55
1992-12-31	64
1993-06-30	266
1993-12-31	343
1994-06-30	304
1994-12-31	278
1995-06-30	321
1995-12-31	288
1996-06-30	381
1996-12-31	447
1997-06-30	454
1997-12-31	448
1998-06-30	485
1998-12-31	458
1999-06-30	430