Bi-annual	US dollars
1987-06-30	593
1987-12-31	460
1988-06-30	614
1988-12-31	629
1989-06-30	853
1989-12-31	439
1990-06-30	363
1990-12-31	316
1991-06-30	415
1991-12-31	316
1992-06-30	457
1992-12-31	830
1993-06-30	743
1993-12-31	822
1994-06-30	835
1994-12-31	616
1995-06-30	681
1995-12-31	673
1996-06-30	710
1996-12-31	789
1997-06-30	789
1997-12-31	694
1998-06-30	805
1998-12-31	429
1999-06-30	596