Bi-annual	US dollars
1987-06-30	498
1987-12-31	560
1988-06-30	379
1988-12-31	400
1989-06-30	372
1989-12-31	342
1990-06-30	375
1990-12-31	428
1991-06-30	517
1991-12-31	685
1992-06-30	683
1992-12-31	774
1993-06-30	822
1993-12-31	508
1994-06-30	545
1994-12-31	630
1995-06-30	531
1995-12-31	606
1996-06-30	538
1996-12-31	563
1997-06-30	1176
1997-12-31	1343
1998-06-30	1891
1998-12-31	2045
1999-06-30	1217