Bi-annual	US dollars
1987-06-30	331
1987-12-31	389
1988-06-30	370
1988-12-31	278
1989-06-30	215
1989-12-31	202
1990-06-30	129
1990-12-31	118
1991-06-30	83
1991-12-31	77
1992-06-30	65
1992-12-31	40
1993-06-30	45
1993-12-31	83
1994-06-30	49
1994-12-31	130
1995-06-30	38
1995-12-31	53
1996-06-30	81
1996-12-31	48
1997-06-30	75
1997-12-31	114
1998-06-30	128
1998-12-31	333
1999-06-30	298