Bi-annual	US dollars
1987-06-30	150
1987-12-31	281
1988-06-30	259
1988-12-31	148
1989-06-30	212
1989-12-31	208
1990-06-30	403
1990-12-31	457
1991-06-30	431
1991-12-31	243
1992-06-30	344
1992-12-31	545
1993-06-30	684
1993-12-31	610
1994-06-30	517
1994-12-31	430
1995-06-30	493
1995-12-31	216
1996-06-30	493
1996-12-31	423
1997-06-30	561
1997-12-31	155
1998-06-30	332
1998-12-31	428
1999-06-30	378