Bi-annual	US dollars
1987-06-30	916
1987-12-31	847
1988-06-30	686
1988-12-31	683
1989-06-30	676
1989-12-31	660
1990-06-30	530
1990-12-31	548
1991-06-30	483
1991-12-31	594
1992-06-30	618
1992-12-31	683
1993-06-30	725
1993-12-31	576
1994-06-30	568
1994-12-31	598
1995-06-30	555
1995-12-31	622
1996-06-30	519
1996-12-31	560
1997-06-30	482
1997-12-31	582
1998-06-30	1004
1998-12-31	1221
1999-06-30	1288