Bi-annual	US dollars
1987-06-30	126
1987-12-31	157
1988-06-30	133
1988-12-31	105
1989-06-30	122
1989-12-31	156
1990-06-30	180
1990-12-31	145
1991-06-30	149
1991-12-31	181
1992-06-30	141
1992-12-31	124
1993-06-30	360
1993-12-31	418
1994-06-30	606
1994-12-31	394
1995-06-30	430
1995-12-31	460
1996-06-30	435
1996-12-31	520
1997-06-30	481
1997-12-31	512
1998-06-30	522
1998-12-31	489
1999-06-30	412